As filed with the Securities and Exchange Commission on November 25, 2003
                                                   Registration No. 333 - 104819
--------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                              -------------------

                         POST-EFFECTIVE AMENDMENT NO. 1
                                       to
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      Under

                           The Securities Act of 1933

                               -------------------

                                ESSEX CORPORATION
             (Exact name of registrant as specified in its charter)

    COMMONWEALTH OF VIRGINIA                            54-0846569
(State or other jurisdiction of       (I.R.S. Employer Identification Number)
 incorporation or organization)

                               9150 Guilford Road
                            Columbia, Maryland 21046
                                 (301) 939-7000
    (Address, including zip code, and telephone number, including area code,
                  of Registrant's principal executive offices)

        Leonard E. Moodispaw                         WITH A COPY TO:
President and Chief Executive Officer           D. Scott Freed, Esquire
         Essex Corporation                  Whiteford, Taylor & Preston L.L.P.
        9150 Guilford Road                      Seven Saint Paul Street
    Columbia, Maryland  21046                  Baltimore, Maryland 21202
          (301) 939-7000                          (410) 347-8700

 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

Approximate date of commencement of proposed sale to public: As soon as
practicable after the effective date of this Registration Statement.

         If the only securities being registered on this form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. / /

         If any of the securities being registered on this form are to be
offered on a delayed or continuous basis pursuant to Rule 415 under the
Securities Act of 1933, other than securities offered only in connection with
dividend or interest reinvestment plans, check the following box. /X/

         If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. / /

         If this form is a post-effective amendment filed pursuant to Rule
462(c) under the Securities Act, check the following box and list the Securities
Act registration statement number of the earlier effective registration
statement for the same offering. / /

         If delivery of the prospectus is expected to be made pursuant to Rule
434, please check the following box. / /

THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF THE
SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THE REGISTRATION STATEMENT SHALL
BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION
8(a), MAY DETERMINE.
--------------------------------------------------------------------------------





                                INTRODUCTORY NOTE

This post-effective amendment no. 1 to Form S-3 removes from this registration
statement and deregisters 350,000 shares of common stock of Essex Corporation
held by certain selling shareholders that have been included for registration in
Amendment No. 1 to the Form S-1 registration statement (333-110287) filed by
Essex Corporation on November 25, 2003.






PROSPECTUS                                SUBJECT TO COMPLETION:         , 2003





                                ESSEX CORPORATION

                        2,671,573 Shares of Common Stock

         We have prepared this prospectus to allow some of our stockholders to
         sell up to 2,671,573 shares of our common stock. These stockholders may
         sell their shares at prices which are based on the market price of the
         stock, on United States exchanges or in negotiated transactions. Essex
         will not receive any of the proceeds from the sale of the shares in the
         offering.

         Our Common Stock trades on the American Stock Exchange under the symbol
         EYW." On July 24, 2003, the last reported sale price of our common
         stock was $5.40 per share.

                            -------------------------

          INVESTING IN OUR COMMON STOCK INVOLVES A HIGH DEGREE OF RISK.
                     SEE "RISK FACTORS" BEGINNING ON PAGE 7.

                            -------------------------


NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THE COMMON STOCK, OR DETERMINED IF
THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                 The date of this Prospectus is _________, 2003.


THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY CHANGE. WE MAY NOT
SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE SEC IS
EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER TO SELL THESE SECURITIES AND IT IS
NOT SOLICITING AN OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER OR
SALE IS NOT PERMITTED.



ESSEX HAS NOT AUTHORIZED ANYONE, INCLUDING ANY SALESPERSON OR BROKER, TO GIVE
ORAL OR WRITTEN INFORMATION ABOUT THIS OFFERING, ESSEX OR THE SHARES COVERED BY
THIS PROSPECTUS THAT IS DIFFERENT FROM THE INFORMATION INCLUDED OR INCORPORATED
BY REFERENCE IN THIS PROSPECTUS. YOU SHOULD NOT ASSUME THAT THE INFORMATION IN
THIS PROSPECTUS, OR ANY SUPPLEMENT TO THIS PROSPECTUS, IS ACCURATE AT ANY DATE
OTHER THAN THE DATE INDICATED ON THE COVER PAGE OF THIS PROSPECTUS OR ANY
SUPPLEMENT TO IT.

                                        2



                       WHERE YOU CAN FIND MORE INFORMATION

         We file annual, quarterly and other reports, proxy statements and other
information with the SEC. Our SEC filings are available to the public over the
Internet at the SEC's web site at http://www.sec.gov. You may also read and copy
any document we file at the SEC's public reference rooms at 450 Fifth Street,
N.W., Washington, D.C., and in New York, New York and Chicago, Illinois. Please
call the SEC at 1-800-732-0330 for further information on the public reference
rooms.

         For purposes of this prospectus, the SEC allows us to "incorporate by
reference" certain information we have filed with the SEC, which means that we
are disclosing important information to you by referring you to other
information we have filed with the SEC. The information we incorporate by
reference is considered part of this prospectus. We specifically are
incorporating by reference the following documents:

o    Our Annual Report on Form 10-KSB for the fiscal year ended December 29,
     2002 and the Form 10-KSB/A No. 1 filed on July 17, 2003

o    Our Current Reports on Form 8-K filed on March 7, 2003, April 17, 2003,
     June 4, 2003 and the Form 8-K/A filed on June 10, 2003.

o    Our Quarterly Report on Form 10-QSB for the fiscal quarter ended March 30,
     2003.

o    All documents filed by us pursuant to Section 13(a), 13(c), 14 or 15(d) of
     the Securities Exchange Act of 1934 after the date of this prospectus and
     before the termination of the offering.

o    The description of our Common Stock in our Form 8-A filed on June 3, 2003,
     as it may be amended from time to time.

         We are delivering with this prospectus a copy of the Form 10-KSB/A No.
1 and the Form 10-QSB referred to above. To obtain a copy of other filings at no
cost, you may write or telephone us at the following address:

                               Corporate Secretary

                                ESSEX CORPORATION

                               9150 Guilford Road

                            Columbia, Maryland 21046

                                 (301) 939-7000

         Neither we nor the selling stockholders have authorized anyone else to
provide you with different information. Neither we nor the selling stockholders
are making an offer of these securities in any state where the state does not
permit an offer.

                                        3



                           FORWARD-LOOKING STATEMENTS

         Some of the statements contained, or incorporated by reference, in this
prospectus discuss future expectations, contain projections of results of
operations or financial condition or state other "forward-looking" information.
Those statements are subject to known and unknown risks, uncertainties and other
factors that could cause the actual results to differ materially from those
contemplated by the statements. The "forward-looking" information is based on
various factors and was derived using numerous assumptions. In some cases, you
can identify these so-called "forward-looking statements" by words like "may,"
"will," "should," "expects," "plans," "anticipates," "believes," "estimates,"
"predicts," "potential," or "continue" or the negative of those words and other
comparable words. You should be aware that those statements only reflect our
predictions. Actual events or results may differ substantially. Important
factors that could cause our actual results to be materially different from the
forward-looking statements are disclosed under the heading "Risk Factors" and
throughout this prospectus.

                                ESSEX CORPORATION

         Based in Columbia, Maryland, Essex develops and commercializes
optoelectronic devices for industry and government. In the area of services,
Essex provides optoelectronic and signal processing expertise to government
customers under highly classified advanced and next generation research and
development contracts, supports the intelligence community mission critical
voice and video systems infrastructure, and provides highly classified systems
engineering to government customers. In the area of products, Essex builds
optical communications and networking system elements and components. Our
products and services incorporate advances achieved through more than two
decades of pioneering work in developing high-throughput optoelectronics
processors and receivers for image, signal and data processing, and advanced
communications applications for U.S. intelligence organizations. See "Our
Products and Services" below for more information about our technology, services
and products under development.

                                        4



                          SUMMARY FINANCIAL INFORMATION

         The following table contains summary information derived from the
financial statements included in our Annual Report on Form 10-KSB for the fiscal
year ended December 29, 2002 and Quarterly Report on Form 10-QSB for the fiscal
quarter ended March 30, 2003, incorporated by reference herein, and should be
read in conjunction with those financial statements and the related notes
thereto.



                                                      FISCAL YEAR ENDED

                                           DECEMBER 29, 2002  DECEMBER 30, 2001
                                           -----------------  -----------------
                                                        

Revenues                                       $ 4,506 419       $ 2,641,776
Operating loss                                 $(2,150,159)      $(3,577,136)
Net loss                                       $(2,173,617)      $(3,569,199)

Basic Loss Per Common Share                    $     (0.29)      $     (0.67)

Diluted Loss Per Common Share                  $     (0.29)      $       (0.67)

                                                  FISCAL QUARTER ENDED

                                          MARCH 30, 2003 (1)  MARCH 31, 2002
                                          ---------------     --------------
                                                        
Revenues                                    $3,001,334          $  763,276
Operating Loss                              $   (4,423)         $ (823,889)
Net Loss                                    $ ( 20,081)         $ (830,031)

Basic Loss Per Common Share                 $   ( 0.00)         $   ( 0.11)

Diluted Loss Per Common Share               $    (0.00)         $   ( 0.11)


                                                   AS OF MARCH 30, 2003
                                               
Working capital                                       $    882,687

Total Assets                                          $   7,586,712
Goodwill                                              $   3,014,000 (2)
Stockholders' Equity                                  $   4,358,438
Accumulated Deficit                                   $ (14,418,443)




1.       Includes one month of operations of Sensys Development Laboratories,
         Inc. (SDL), which we acquired as of March 1, 2003. See "RECENT
         DEVELOPMENTS" below.

2.       Reflects goodwill resulting from our acquisition of SDL.


                                        5



                                  THE OFFERING

Shares of common stock offered by us         None


Shares of common stock that may be           2,671,573
sold by the selling stockholders


Use of Proceeds                              We will not receive any proceeds
                                             from the resale of the shares
                                             offered hereby, all of which
                                             proceeds will be paid to the
                                             Selling Stockholders. See "Use of
                                             Proceeds" on page 18.


Risk                                         Factors The purchase of our common
                                             stock involves a high degree of
                                             risk. You should carefully review
                                             and consider the disclosure under
                                             "Risk Factors" beginning on page 7.

American Stock Exchange Trading Symbol       EYW

                               RECENT DEVELOPMENTS

         RESULTS FOR THE SECOND FISCAL QUARTER 2003. On July 23, 2003, Essex
reported revenues of $4,149,000 during the second fiscal quarter of 2003
compared to $729,000 in the same period during 2002. Revenue for the first half
of 2003 was $7,150,000 compared to $1,493,000 during the first half of 2002. The
Company also reported net income of $75,000 during the second fiscal quarter of
2003 compared to a net loss of $835,000 in the same period of 2002. Net income
for first half of 2003 was $54,000 compared to a net loss of $1,665,000 for the
same period in 2002.

         ACQUISITION OF SENSYS DEVELOPMENT LABORATORIES, INC. Effective March 1,
2003 Essex acquired Sensys Development Laboratories, Inc. (SDL), a
Maryland-based provider of systems and software engineering services to the
intelligence community. SDL's skill and experience are highly complementary to
Essex's core competencies in image and signal processing technology. The
acquisition adds over 25 employees, an estimated $4 million to Essex 2003
revenues and a solid base of contracts with excellent growth potential. SDL's
revenues were approximately $3.1 million and $1.1 million for the fiscal year
ended September 30, 2002 and the fiscal quarter ended December 31, 2002,
respectively. Historical financial statements of SDL and pro forma information
presenting the effect of the acquisition as if it had been completed on December
30, 2001 are contained in our Current Report on Form 8-K filed with the SEC on
April 17, 2003. The Form 8-K is incorporated in this prospectus by reference.



                                        6



                                  RISK FACTORS

         You should carefully consider the following risk factors before
deciding to invest in our Common Stock. You should also consider the other
information in this prospectus and the additional information in our other
reports on file with the SEC and in the other documents incorporated by
reference in this prospectus. See "Where You Can Find More Information" on page
3.

                     RISKS RELATED TO OUR FINANCIAL RESULTS

WE HAVE A HISTORY OF NET LOSSES AND WE MAY NOT ACHIEVE OR SUSTAIN PROFITABILITY.

         We incurred a net loss for each of our fiscal years ended December 29,
2002 and December 30, 2001 and for our fiscal quarter ended March 30, 2003. The
Company also incurred net losses in fiscal 2000 and 1998. In 1999, we reported a
small net income. As of March 30, 2003, we had an accumulated deficit of $14.4
million. Our revenues have increased from $2.6 million in fiscal 2001 to $4.5
million in fiscal 2002, primarily as a result of higher revenues on new and
expanding U.S. Government programs. In the first fiscal quarter of 2003 our
revenues were approximately $3.0 million compared to revenues of $763,000 in the
same quarter in 2003, primarily as a result of expansion of government programs
and the inclusion of one month of results for SDL, which we acquired effective
March 1, 2003. Since September 2000, we have primarily funded our operations
from the sale of equity securities. We also expect to incur significant but
reduced product development and related expenses, and as a result we will need
to increase revenues to achieve profitability.

WE MAY REQUIRE ADDITIONAL FINANCING TO DEVELOP COMMERCIAL APPLICATIONS OF OUR
TECHNOLOGIES, WHICH FINANCING MAY NOT BE AVAILABLE ON TERMS ACCEPTABLE TO US OR
AT ALL.

         Between September 2000 and December 2002, we have received
approximately $6.6 million from Private Investors to pursue commercial
applications of our optical and wireless communications technologies and
resulting products. While the Company believes that it will generate a modest
amount of funds for development activities from internally generated sources
over the next 12 to 24 months, receipt of additional financing from external
sources would enable to Company to fund more significant development activities
on a faster time frame. Our actual capital requirements depend upon several
factors that are difficult to predict, including the timing of market acceptance
of our commercial products under development, our ability to establish and
expand our customer base for our commercial products and services, the level of
expenditures for sales and marketing and general and administrative functions,
the level of revenues from our U.S. Government contracts, the cost of offering
additional services and other factors. If our capital requirements vary
materially from those currently planned, we may require additional financing
sooner than anticipated.

         The capital raising environment for small-cap companies like Essex that
are developing communications technology products has been and remains in a
depressed state. Thus, if additional equity funding becomes available it may be
based on an unacceptably low valuation for the Company and/or its technology
assets. As a result, we cannot assure you that additional funding will be
available or could be obtained in sufficient amounts or on terms acceptable to
us, if at all, or on terms that would not include substantial dilution to our
stockholders. The Company has not yet demonstrated the sustained profitable
operations required to obtain

                                        7



traditional bank or other debt financing and does not have sufficient fixed
tangible assets to acquire funds from asset based lenders. As a result, for the
foreseeable future additional funding for development will likely come from
equity financing. Without additional external financing, we may have to curtail
or eliminate development.

                          RISKS RELATED TO OUR BUSINESS

WE CURRENTLY  RELY ON SALES TO U.S.  GOVERNMENT  ENTITIES,  AND THE LOSS OF SUCH
CONTRACTS WOULD HAVE A MATERIAL ADVERSE IMPACT ON OUR OPERATING RESULTS.

         During fiscal 2002 and 2001, contracts with the U.S. Government,
primarily the military services and other departments and agencies of the
Department of Defense (DoD), accounted for approximately 97%, or $4.4 million of
our revenues, and 84%, or $2.2 million of our revenues, respectively. In the
fiscal quarter ended March 30, 2003, revenues on U.S. Government programs were
$2.9 million, or 96.3% of our revenues.

         The loss or significant reduction in government funding of a large
program in which we participate could also materially adversely affect our
future revenues, earnings and cash flows and thus our ability to meet our
financial obligations. U.S. Government contracts are conditioned upon the
continuing approval by Congress of the amount of necessary spending. Congress
usually appropriates funds for a given program each fiscal year even though
contract periods of performance may exceed one year. Consequently, at the
beginning of a major program, the contract is usually partially funded, and
additional monies are normally committed to the contract only if appropriations
are made by Congress for future fiscal years.

GOVERNMENT CONTRACTS CONTAIN UNFAVORABLE  TERMINATION PROVISIONS AND ARE SUBJECT
TO AUDIT AND MODIFICATION.

         Companies engaged in supplying defense-related services and equipment
to U.S. Government agencies are subject to certain business risks peculiar to
the defense industry. These risks include the ability of the U.S. Government to
unilaterally:

o    suspend us from  receiving  new  contracts  pending  resolution  of alleged
     violations of procurement laws or regulations;

o    terminate existing contracts;

o    reduce the value of existing contracts;

o    audit our  contract-related  costs and fees,  including  allocated indirect
     costs; and

o    control and potentially prohibit the export of our products.

         Any of our U.S. Government contracts can be terminated by the U.S.
Government either for its convenience or if we default by failing to perform
under the contract. Termination for convenience provisions provide only for our
recovery of costs incurred or committed, settlement expenses and profit on the
work completed prior to termination. Termination for default provisions provide
for the contractor to be liable for excess costs incurred by the U.S. Government
in procuring undelivered items from another source.

                                        8



OUR FIXED PRICE CONTRACTS MAY COMMIT US TO UNFAVORABLE TERMS.

         We provide some of our products and services through fixed price
contracts. Fixed price contracts provided 45% and 28% of our sales for fiscal
2001 and 2002, respectively. In a fixed price contract, the price is not subject
to adjustment based on cost incurred to perform the required work under the
contract. Therefore, we fully absorb cost overruns on fixed price contracts and
this reduces our profit margin on the contract. Those cost overruns may result
in a loss. A further risk associated with fixed price contracts is the
difficulty of estimating sales and costs that are related to performance in
accordance with contract specifications and the possibility of obsolescence in
connection with long-term procurements. Failure to anticipate technical
problems, estimate costs accurately or control costs during performance of a
fixed price contract may reduce our profit or cause a loss on the contract.

SINCE WE ARE CURRENTLY DEVELOPING OUR OPTICAL AND WIRELESS TELECOMMUNICATIONS
PRODUCTS IT IS DIFFICULT TO EVALUATE OUR FUTURE BUSINESS AND PROSPECTS.

         We have traditionally derived our revenues from providing engineering,
communications and signal processing services to the U.S. Government. While we
continue to provide these services, over the past year we have continued to
emphasize our work on developing new optoelectronics telecommunications
products, including HYPERFINE WDM fiber optic communications technology and
Optical Processor Enhanced Receiver Architecture (OPERA(TM)) technology. Because
our development efforts on these products are ongoing and we have not begun
significant commercial sales of these products, our revenue and profit potential
is unproven and our limited history in the commercial telecommunications field
makes it difficult to evaluate our business and prospects. We have difficulty
accurately forecasting our commercial revenue, and we have limited historical
financial data upon which to base operating production budgets. You should
consider our business and prospects in light of the heightened risks and
unexpected expenses and problems we may face as a company developing new
commercial products for a rapidly changing industry.

IF WE DO NOT SUCCESSFULLY IMPLEMENT OUR PLAN TO EXPAND INTO COMMERCIAL MARKETS
WE WILL HAVE LESS POTENTIAL FOR GROWTH IN REVENUES AND PROFITS AND OUR STOCK
PRICE AND VALUATION MAY DECLINE.

         In  addition  to  continuing  to  pursue  our  business  with  the U.S.
Government,  we are focusing our technical capabilities and expertise on related
commercial  markets,  including  HYPERFINE WDM,  OPERA(TM) and ImSyn(TM).  These
products are still under various sTages of development. As such, these products
are subject to certain risks and may require us to:

o    develop marketing, sales and customer support capabilities;

o    obtain customer and/or regulatory certification;

o    respond to rapid technological advances; and

o    obtain customer acceptance of these products and product performance.

         Our efforts to enter commercial markets will require significant
resources, including additional working capital and capital expenditures, as
well as the use of management's time. Our efforts to sell our commercial
telecommunications products, particularly our optical networking and broadband
wireless communications products, also may depend to a significant

                                        9



degree on the efforts of independent distributors or communication service
providers. We can not assure you that these distributors or service providers
will be able to market our products or their services successfully or that we
will be able to realize a return on our investments in them.

         If we are not successful in addressing the above risks or in developing
these commercial business opportunities then our business will remain primarily
that of a government contractor. In that event, the Company will have less
potential for significant growth in revenues and profits and will be valued by
investors accordingly. The Company's failure to develop commercial markets for
its technologies may lead investors that purchased our stock based on the
potential for such markets to sell their shares and this could cause our stock
price and valuation to decline.

OUR STRATEGY INVOLVES PURSUING  STRATEGIC  ACQUISITIONS AND INVESTMENTS THAT MAY
NOT BE SUCCESSFUL.

         Our business strategy includes acquiring or making strategic
investments in other companies with a view to expanding our portfolio of
products and services, acquiring new technologies, and accelerating the
development of new or improved products. To do so, we may issue equity that
would dilute our current shareholders' percentage ownership or incur or assume
indebtedness. In addition, we may incur significant amortization expenses
related to intangible assets. We also may incur significant write-offs of
goodwill associated with companies, businesses or technologies that we acquire.
Acquisitions and strategic investments involve numerous risks, including:

o    difficulties in integrating the operations,  technologies,  and products of
     the acquired companies;

o    diversion of management's attention from our core business;

o    potential difficulties in completing projects of the acquired company;

o    the potential loss of key employees of the acquired company; and

o    dependence on unfamiliar or relatively small supply partners.

         In addition, acquisitions and strategic investments may involve risks
of entering markets in which we have no or limited direct prior experience,
where competitors in such markets have stronger market positions and of
obtaining insufficient revenues to offset increased expenses associated with
acquisitions.

OUR SUCCESS LARGELY DEPENDS ON OUR ABILITY TO RETAIN KEY PERSONNEL.

         Our success has always depended in large part on our ability to attract
and retain highly-skilled technical, managerial, sales and marketing personnel,
particularly those skilled and experienced in optoelectronics and optical
communications equipment. The loss of key personnel may prevent us from
completing current development and restrict new development.

                                       10



IF WE ARE UNABLE TO DEVELOP AND SUCCESSFULLY INTRODUCE NEW AND ENHANCED PRODUCTS
THAT MEET THE NEEDS OF OUR CUSTOMERS IN A TIMELY MANNER, OUR REVENUES AND
RESULTS OF OPERATIONS COULD BE ADVERSELY AFFECTED.

         Our future success depends on our ability to anticipate our customers'
needs and develop products that address those needs. Technological change in the
optical networking industry is occurring at a rapid pace. As a result, we expect
there to be frequent new product introductions, changes in customer requirements
and evolving industry standards. We may not be able to develop new products or
enhancements to our existing products in a timely manner, or at all. This would
cause potential customers to seek other solutions, which would reduce our
revenues and adversely affect our results of operations and financial condition.

         We are currently developing many potential optical networking products
through our research and development efforts. Although we have several products
in development, we may not bring all of these potential products into commercial
production due to:

o    changes in customer demand;

o    technological developments that make our products less competitive;

o    evolving industry standards; or

o    allocation of our limited resources to other products or technologies.

         If we incur significant expenses developing products that we do not
produce commercially, or if we select the wrong products or technologies to
bring into commercial production, our revenues and results of operations could
be adversely affected and we may not recover significant research and
development expenses.

ONE ASPECT OF OUR SUCCESS IS DEPENDENT ON OUR OPTOELECTRONICS TELECOMMUNICATIONS
PRODUCTS BEING DEVELOPED. FAILURE OF OUR PRODUCTS TO OPERATE AS EXPECTED COULD
DELAY OR PREVENT THEIR DEPLOYMENT AND SALE AND COULD SERIOUSLY IMPAIR OUR
COMMERCIAL BUSINESS AND PROSPECTS.

         Our future growth and success depends in part on the commercial success
of our optical and wireless telecommunications products being developed. We have
begun limited commercial sales of our products and have produced devices only to
specifications required in order to conduct laboratory tests and field trials.
Some of our devices have been deployed in field trials, others have been tested
in our laboratories and still others are in earlier stages of development. If
our products fail to operate as expected, this could delay or prevent their
deployment and sale and could seriously impair our business and prospects.

THE MARKET WE INTEND TO SERVE IS HIGHLY COMPETITIVE AND WE MAY NOT BE ABLE TO
ACHIEVE OR MAINTAIN PROFITABILITY.

         Competition in the network communications equipment market is intense.
This market has historically been dominated by such large companies as Alcatel,
Ciena, Cisco Systems, JDS Uniphase, Lucent Technologies, NEC and Nortel
Networks. Some of these companies, as well as emerging companies, are currently
developing products that may compete in the specialty areas that Essex's
technology is designed to address. We may face competition from other large

                                       11



communications companies who may enter our proposed markets. Many of these
possible competitors have longer operating histories, greater name recognition,
larger customer bases and greater financial, technical and sales and marketing
resources than we do and may be able to undertake more extensive marketing
efforts and adopt more aggressive pricing policies than we can. Due to the
rapidly evolving markets in which we compete, additional competitors with
significant market presence and financial resources may enter our markets,
further intensifying competition.

IF WE ARE UNABLE TO PROTECT OUR INTELLECTUAL PROPERTY EFFECTIVELY, WE MAY BE
UNABLE TO PREVENT THIRD PARTIES FROM USING OUR TECHNOLOGIES, WHICH WOULD IMPAIR
OUR COMPETITIVE ADVANTAGE.

         We rely on a combination of patent, copyright, trademark and trade
secret laws and restrictions on disclosure to protect our intellectual property
rights. We also enter into confidentiality or license agreements with our key
employees and consultants and control access to and distribution of our
software, documentation and other proprietary information. The Company believes
that its patents and patent applications provide it with a competitive
advantage. Accordingly, in the event the Company's products and technologies
under development gain market acceptance, patent protection would be important
to the Company's business. However, obtaining patent and other intellectual
property protection may not adequately protect our rights or permit us to gain
or keep any competitive advantage. For instance, unauthorized parties may
attempt to copy, reverse engineer or otherwise obtain and use our patented
products or technology without our permission, thus eroding or eliminating the
competitive advantage we hope to gain though the exclusive rights provided by
patent protection. Moreover, our existing patents and patents we have applied
for (if granted) may not protect us against competitors that independently
develop proprietary technologies that are substantially equivalent or superior
to our technologies, or design around our patents. In addition, the competitive
advantage provided by patenting our technology may erode if we do not upgrade,
enhance and improve our technology on an ongoing basis to meet competitive
challenges.

         Monitoring unauthorized use of our technology is difficult, and we
cannot be certain that the steps we have taken will prevent unauthorized use of
our technology, particularly in foreign countries where the laws may not protect
our proprietary rights as fully as in the United States. A complete description
of Essex's patents and patent applications is contained in our Annual Report on
Form 10-KSB for fiscal 2002. The Form 10-KSB is incorporated in this prospectus
by reference and we are delivering a copy of the report together with this
prospectus.

THERE IS A RISK THAT SOME OF OUR PATENT APPLICATIONS WILL NOT BE GRANTED.

         Although we have received notice of allowance of our first HYPERFINE
WDM patent, we have filed several other applications for U.S. patents relating
to our HYPERFINE WDM and OPERA(TM) technologies, and there is a risk that some
or all of the pending applications will not issue as patents. Although we
believe our patent applications are valid, the failure of our pending
applications to issue as patents would affect the competitive advantage we hope
to gain by obtaining patent protection and thus likely could have a material
adverse effect upon our business and results of operations.

                                       12



WE MAY BECOME INVOLVED IN INTELLECTUAL PROPERTY DISPUTES, WHICH COULD SUBJECT US
TO SIGNIFICANT LIABILITY, DIVERT THE TIME AND ATTENTION OF OUR MANAGEMENT AND
PREVENT US FROM SELLING OUR PRODUCTS.

         We or our customers may be a party to litigation in the future to
protect our intellectual property or to respond to allegations that we infringe
on others' intellectual property. Any parties asserting that our products
infringe upon their proprietary rights would force us to defend ourselves and
possibly our customers against the alleged infringement. If we are unsuccessful
in any intellectual property litigation, we could be subject to significant
liability for damages and loss of our proprietary rights. Intellectual property
litigation, regardless of its success, would likely be time consuming and
expensive to resolve and would divert management's time and attention. In
addition, we could be forced to do one or more of the following:

o    stop  selling,  incorporating  or  using  our  products  that  include  the
     challenged intellectual property;

o    obtain from the owner of the infringed intellectual property right a
     license to sell or use the relevant technology, which license may not be
     available on reasonable terms, or at all; or

o    redesign those products that use the technology.

         If we are forced to take any of these actions, our business could be
seriously harmed.

IF NECESSARY LICENSES OF THIRD-PARTY TECHNOLOGY ARE NOT AVAILABLE TO US OR ARE
VERY EXPENSIVE, OUR BUSINESS WOULD BE SERIOUSLY HARMED.

         From time to time we may be required to license technology from third
parties to sell or develop our products and product enhancements. These
third-party licenses may not be available to us on commercially reasonable
terms, if at all. Our inability to maintain or obtain any third-party license
required to sell or develop our products and product enhancements could require
us to obtain substitute technology of lower quality or performance standards or
at greater cost. If we were required to use technology with lower performance
standards or quality, customers may stop buying our products and this would
cause our revenues to decline. Similarly, if our costs rise significantly,
customers may choose less expensive alternative products, which would cause our
revenues to decline.

                RISKS RELATED TO THE OPTICAL NETWORKING INDUSTRY

THE OPTICAL NETWORKING INDUSTRY IS DEVELOPING, UNPREDICTABLE AND CHARACTERIZED
BY RAPID TECHNOLOGICAL CHANGES AND EVOLVING STANDARDS. IF THIS INDUSTRY DOES NOT
DEVELOP AND EXPAND AS WE ANTICIPATE, DEMAND FOR OUR PRODUCTS MAY FAIL TO GROW OR
MAY DECLINE, WHICH WOULD ADVERSELY AFFECT OUR REVENUES.

         The optical networking industry is developing and characterized by
rapid technological change, frequent new product introductions, changes in
customer requirements and continuously evolving industry standards. As a result,
it is difficult to predict its potential size and future growth rate. In
addition, evolving customer requirements and industry standards are uncertain.
Our success in generating revenues in this evolving market will depend on our
ability to:

                                       13



o    establish, maintain and enhance our relationships with optical networking
     customers;

o    convince our customers of the benefits of next-generation optical networks;
     and

o    predict accurately, and develop our products to meet, evolving customer
     requirements and industry standards.

         If we fail to address changing market conditions, sales of our products
may fail to grow or may decline, which would adversely affect our revenues.

THE OPTICAL NETWORKING EQUIPMENT INDUSTRY IS EXPERIENCING DECLINING AVERAGE
SELLING PRICES, WHICH COULD ADVERSELY AFFECT OUR REVENUES AND GROSS MARGINS.

         The optical networking equipment industry is experiencing declining
average selling prices as a result of increasing competition and greater unit
volumes as communications service providers continue to deploy fiber optic
networks. We anticipate that average selling prices will continue to decrease in
the future in response to product introductions by competitors, price pressures
from significant customers and greater manufacturing efficiencies. These average
selling price declines may contribute to a decline in our gross margins, which
could adversely affect our results of operations.

IF THE INTERNET AND COMMERCIAL DATA NETWORKS DO NOT CONTINUE TO EXPAND AND
NEXT-GENERATION OPTICAL NETWORKS ARE NOT DEPLOYED AS RAPIDLY AS WE ANTICIPATE,
SALES OF OUR PRODUCTS UNDER DEVELOPMENT MAY DECLINE, AND OUR REVENUES MAY BE
ADVERSELY AFFECTED.

         Our future commercial success depends on the continued growth of the
Internet and commercial data networks for commerce and communications, the
continuing increase in the amount of data transmitted over communications
networks and the increasing adoption of, and improvements to, optical networks
to meet the increased demand for bandwidth. If data networks, including the
Internet, do not continue to expand as a widespread communications medium and
commercial marketplace, the need for significantly increased bandwidth across
networks and the market for optical networking products may not continue to
develop. Future demand for the products we are developing is uncertain and will
depend to a great degree on the continued growth and upgrading of optical
networks.

BECAUSE OPTICAL PRODUCTS ARE COMPLEX AND ARE DEPLOYED IN COMPLEX ENVIRONMENTS,
THE PRODUCTS WE ARE DEVELOPING MAY HAVE DEFECTS THAT WE DISCOVER ONLY AFTER FULL
DEPLOYMENT, WHICH COULD SERIOUSLY HARM OUR BUSINESS.

         Optical products are complex and are designed to be deployed in large
quantities across complex networks. Because of the nature of the products, they
can only be fully tested when completely deployed in large networks with high
amounts of traffic. Customers may discover errors or defects in the hardware or
the software, or products we develop may not operate as expected, after they
have been fully deployed. If we are unable to fix defects or other problems that
may be identified in full deployment, we would likely experience:

o    loss of, or delay in, revenue and loss of market share;

o    loss of existing customers;

                                       14



o    difficulties in attracting new customers or achieving market acceptance;

o    diversion of development resources;

o    increased service and warranty costs;

o    legal actions by our customers; and

o    increased insurance costs.

         The occurrence of any of these problems could seriously harm our
business, financial condition and results of operations. Defects, integration
issues or other performance problems could result in financial or other damages
to our customers or could negatively affect market acceptance for the products
we develop. Our customers could also seek damages for losses from us, which, if
they were successful, would seriously harm our business, financial condition and
results of operations. A product liability claim brought against us, even if
unsuccessful, would likely be time consuming and costly and would put a strain
on our management and resources.

                         RISKS RELATED TO THIS OFFERING

A LIMITED NUMBER OF STOCKHOLDERS ARE ABLE TO EXERT SIGNIFICANT INFLUENCE OVER
MATTERS REQUIRING STOCKHOLDER APPROVAL.

         Since September 2000, the Company has engaged in several private
placements with a few private investors or their affiliates. We refer to these
entities and their affiliates as the "Private Investors". As of the date of this
prospectus, these Private Investors hold collectively approximately 3.6 million
shares of common stock, including 1,166,666 shares of Common Stock covered by
this Prospectus. The Private Investors also hold warrants exercisable under
certain circumstances for up to two million shares of our common stock.
Accordingly, the Private Investors could seek to exercise significant control
and influence of certain actions requiring the approval of the holders of shares
of our common stock. This concentration of ownership may also delay or prevent a
change in control of Essex or reduce the price other investors might be willing
to pay for our common stock. In addition, the interests of the Private Investors
may conflict with the interests of other holders of our common stock.

THERE IS CURRENTLY ONLY A LIMITED PUBLIC MARKET FOR OUR COMMON STOCK AND OUR
COMMON STOCK IS SUBJECT TO SIGNIFICANT PRICE fluctuations.

         Our common stock has recently been included for listing on the American
Stock Exchange (AMEX). Prior to the AMEX listing, our common stock was traded on
the OTC Bulletin Board. Historically, there has been only a limited public
market for our common stock and we do not expect an active and robust trading
market to develop until the number of shares in the hands of the public is
substantially increased. In addition, in the event our operating results fall
below the expectations of public market analysts and investors, the market price
of our common stock would likely be materially adversely affected.

         The trading price of our common stock is likely to be volatile and
sporadic. The stock market in general, and the market for technology companies
in particular, has experienced extreme volatility. This volatility has often
been unrelated to the operating performance of particular companies. Volatility
in the market price of our common stock may prevent investors

                                       15



from being able to sell their common stock at or above the price such investors
paid for their shares or at any price at all.

SALES BY THE SELLING STOCKHOLDERS OR OTHERS OF A SIGNIFICANT NUMBER OF SHARES OF
COMMON STOCK COULD HAVE A MATERIAL ADVERSE EFFECT ON PREVAILING MARKET PRICES.

         We cannot predict what effect, if any, that future sales of shares, or
the availability of shares for future sale, will have on the market price of our
common stock prevailing from time to time. Nevertheless, sales of substantial
amounts of common stock by the selling stockholders, or the perception that such
sales may occur, could have a material adverse effect on prevailing market
prices.

         At March 31, 2003, we have outstanding approximately 8.9 million shares
of our common stock, approximately 4,348,000 of which were sold or issued by us
in private transactions in reliance upon exemptions from registration under the
Securities Act. (See "Other Business Information - Recent Developments" in our
2002 Form 10-KSB for further information.) These privately placed shares may be
sold only pursuant to an effective registration statement filed by Essex or an
applicable exemption, including the exemption contained in Rule 144 promulgated
under the Securities Act. In general, under Rule 144 as currently in effect, a
shareholder, including an affiliate of Essex, may sell shares of common stock
after at least one year has elapsed since such shares were acquired from us or
an affiliate of ours. The number of shares of common stock which may be sold
within any three- month period is limited to the greater of one percent of the
then outstanding number of shares of common stock or the average weekly trading
volume in the common stock during the four calendar weeks preceding the date on
which notice of such sale was filed under Rule 144. Certain other requirements
of Rule 144 concerning availability of public information, manner of sale and
notice of sale must also be satisfied. In addition, a shareholder who is not our
affiliate (and who has not been our affiliate for 90 days prior to the sale) and
who has beneficially owned shares acquired from us or our affiliate for over two
years may resell the shares without compliance with the foregoing requirements
under Rule 144.

         In addition to the shares covered by this prospectus, the Private
Investors have been granted rights to have up to 2,000,000 shares of common
stock issuable upon exercise of warrants registerable under the Securities Act
upon demand and another approximately 600,000 shares of common stock through
"piggy-back" registration rights. We have also filed a registration statement to
register an additional 785,000 shares held by the Private Investors and by other
parties. Sales of substantial amounts of common stock under Rule 144 or pursuant
to the holder's registration rights, or the perception that such sales may
occur, could have a material adverse effect on prevailing market prices.

WE ARE AT RISK OF SECURITIES CLASS ACTION LITIGATION DUE TO OUR EXPECTED STOCK
PRICE VOLATILITY.

         In the past, securities class action litigation has often been brought
against companies after periods of volatility in the market price of their
securities. Securities litigation could result in substantial costs and divert
management's attention and resources from our business. Due to the potential
volatility of our stock price, we may be the target of securities litigation in
the future.

                                       16



                            OUR PRODUCTS AND SERVICES

         Capitalizing on our expertise and success in developing and building
optoelectronic systems for national security applications, we has developed five
core areas of technological expertise and intellectual property:

1)   Optoelectronic processors and processing (including the Advanced Optical
     Processor (AOP) program and Optical Processor Enhanced Receiver
     Architecture (OPERA(TM)) technology);

2)   HYPERFINE WAVELENGTH DIVISION MULTIPLEXING (WDM) technology for
     telecommunications;

3)   Communications services (including the capabilities of the newly formed
     Communications Services Division);

4)   Signal processing (including the capabilities of recently acquired Sensys
     Development Laboratories, Inc.); and

5)   Virtual Lens Imaging (VLI) technology (including the ImSyn(TM)processor and
     technology, for above and below ground imaging).


         Our services and products for sale and under development include:

o    The  Advanced  Optical  Processor  (AOP)  being  developed  by Essex  under
     contract  for the United  States  Missile  Defense  Agency (MDA) is a third
     generation device which leverages spread spectrum signal analysis, wideband
     ELINT (electronic  intelligence) and cryptologic  exploitation.  The AOP is
     used for ballistic missile defense environments. In these environments, not
     only must the missile  target be  identified  using  Range-Doppler  Imaging
     (RDI), but other items that are sent into the threat environment to make it
     harder to identify and "kill" the missile  target must also be  identified.
     Other items launched along with the missile include chaff, debris,  closely
     spaced objects,  jammers,  spoofers and missile  decoys.  The AOP is a high
     performance radar signal processor that provides the true correlation-based
     image  formation for ballistic  missile  defense in a  cost-effective,  low
     size, low weight and low power package. Separately, OPERA(TM), an optically
     enhanced  digital  signal  processing   technology,   has  demonstrated  in
     laboratory  modeling  a dramatic  increase  in the  quality of service  and
     carrying  capacity for CDMA wireless  telecommunications  systems.  Further
     development  and testing of  OPERA(TM)has  been  temporarily  delayed until
     funding is identified and obtained to finance such activity.

o    An all-optical, all-passive technique, HYPERFINE WDM fiber optic
     communications technology, which has shown to significantly increase the
     number of channels and their combined bandwidth used for DWDM. The core
     HYPERFINE WDM technology provides:

-    All passive optical components;

                                       17



-    Simple and small packaging, using standard manufacturing processes;

-    Excellent channel isolation;

-    High density--50 MHz to 100 GHz spacing;

-    Superior response and flat filter shapes with excellent channel isolation;

-    Passband shapes that can be tailored for each application;

-    Low insertion loss;

-    Low temperature sensitivity; and

-    Fixed or tunable designs.

o    In late 2002 Essex received a telecommunication services contract with a
     potential total multiyear contract value of $30 million and formed the
     Communications Services Division (CSD) to provide telecommunication systems
     support in the area of modernization, project management, integration and
     engineering analysis. The CSD will focus on supporting the intelligence
     community's mission-critical voice and video systems and associated
     infrastructure.

o    Essex has acquired SDL, a Maryland-based provider of systems and software
     engineering services to the intelligence community. SDL's skill and
     experience are highly complementary to Essex's core competencies in image
     and signal processing technology.

o    The Virtual Lens  Imaging  technology  (VLI) is a patented  high-resolution
     imaging  system that  leverages  Essex's  experience in synthetic  aperture
     imagery and optoelectronic system development. The Company's VLI technology
     is  based  on the key  features  of its  optoelectronic  processor  and its
     ability to calculate images from non-uniform data in real time. Separately,
     our high-speed optoelectronic processor, Image Synthesis (ImSynTM), enables
     extraordinarily  fast  processing of data for complex  visual image systems
     including radar imaging,  magnetic resonance imaging (MRI),  microscopy and
     ultrawideband  signal  processing.  We  are  currently  seeking  additional
     funding  to  further  the  development  and  testing  of second  generation
     ImSyn(TM) processors in 2003.

         Essex currently does not have sufficient resources to bring all of its
telecommunications and optoelectronics processing devices to market.
Accordingly, Essex will likely have to partner with or enter into licensing
arrangements with major industry participants in order to successfully introduce
in large volume its technology and products. In addition, several optical
telecommunications and fiber optic companies, both established and emerging, are
currently developing products that may compete in the specialty areas that
Essex's technology is designed to address. Most of these companies are larger
and more established than Essex and have existing customer bases and
significantly greater access to capital resources than Essex. See "RISK
FACTORS."

                                 USE OF PROCEEDS

         We will not receive any proceeds from the sale of the Common Stock by
the selling stockholders.

                                       18





                              SELLING STOCKHOLDERS

         This prospectus relates to the offering by the stockholders named in
the prospectus for the resale of shares of common stock as set forth below.
Throughout this prospectus, we may refer to these stockholders and their
pledgees, donees, transferees or other successors in interest who receive shares
in non-sale transactions, as the "selling stockholders." If they sell all of
these shares in this offering, the selling stockholders will beneficially own
the shares of our Common Stock as shown below.

         The table below sets forth the following information as of September
28, 2003 with respect to each selling stockholder based on information provided
by or on behalf of the selling stockholders: (i) name and nature of any position
or other relationship with us within the past three years; (ii) the number and
percentage of total outstanding shares of our Common Stock each selling
stockholder beneficially owned before this offering; (iii) the number of shares
of Common Stock the selling stockholder is offering; and (iv) the number and
percentage of total outstanding shares of our Common Stock that the selling
stockholder will own after the selling stockholder sells all of the shares in
this offering.

         Beneficial ownership is determined in accordance with the rules of the
Securities and Exchange Commission and includes voting or investment power with
respect to securities. Shares of our Common Stock subject to options or warrants
that are currently exercisable or exercisable within 60 days of the date of this
table are deemed outstanding and beneficially owned by the person holding such
options or warrants. These shares, however, are not considered outstanding when
computing the percentage ownership of any other person.



                                                  Percentage                                       Percentage
                                                      of                                               of
                                                 Outstanding                                       Outstanding
                                                  Shares of                                         Shares of
                               Amount and           Common                           Amount and      Common
                                 Nature             Stock                             Nature of       Stock
                              of Beneficial      Beneficially                        Beneficial    Beneficially
                                Ownership           Owned        Shares of Common     Ownership       Owned
  Name and Address of          Before the           Before         Stock Offered      After the    After this
    Beneficial Owner            Offering         the Offering         Hereby          Offering      Offering
---------------------------------------------------------------------------------------------------------------
                                                                                            
GEF Management

   Corporation ("GEF") (1)  1,450,700               14.6            100,000          1,350,700            13.6
Global Environment
   Strategic Technology
   Partners, LLC
   ("GESTP")(2)             1,164,166               13.0            766,666            397,500             3.3
Caroline S. Pisano(3)         808,000                8.7            350,000             58,000             *
James A. Katra(4)             470,571                5.3            437,602             32,969             *
David W. Morsberger(5)        231,189                2.6            231,189                250             *
Robert J. Hilton(6)           214,758                2.4            214,758                  0             *
Jeffery M. Brown(7)           171,392                1.9            171,392                  0             *
Richard E. Krauss, Jr(8)       14,857                *               14,857                  0             *
Richard B. Taber, Jr.(9)       18,571                *               18,571                  0             *
---------------------------------------------------------------------------------------------------------------
Robert F. Welte(9)              9,360                *                9,360                  0             *
---------------------------------------------------------------------------------------------------------------
Lawrence H. Young, Jr.(9)       4,457                *                4,457                  0             *








                                                                                            
Mark G. Froehly(9)              1,634                *                1,634                  0             *
---------------------------------------------------------------------------------------------------------------
Anthony F. Zaukus, Jr.(9)         743                *                  743                  0             *
---------------------------------------------------------------------------------------------------------------
Mark D. Nichols(9)                594                *                  594                  0             *


*Less than 1%

     (1) Includes 332,500 shares transferred to GEF by GEF Optical Investment
         Company, LLC ("Optical"), an affiliated entity that was formerly listed
         as a selling stockholder herein. Also includes: (i) 250,000 shares of
         common stock issuable upon the exercise of warrants held by GEF and
         750,000 shares issuable upon the exercise of warrants held by GEF
         Technology Managers Co., LLC, an affiliated entity, and (ii) 118,200
         shares held by Global Environmental Capital Co., LLC, an affiliated
         entity. GEF may be deemed to beneficially own the shares held by these
         affiliated entities as described in footnote (2) below.

     (2) Includes 997,500 shares transferred to GESTP by Optical. H. Jeffrey
         Leonard, the Chairman of the Board of Essex, is a director of the
         managing member of GEF. Based upon a schedule 13D/A filed with the
         Securities and Exchange Commission on November 18, 2002, each of GEF
         and GESTP and Mr. Leonard may have beneficial ownership of all shares
         held by GEF, GESTP and affiliated entities. Mr. Leonard has voting
         and/or investment control of these shares.

     (3) Includes 400,000 shares of common stock issuable upon the exercise of
         warrants. Caroline S. Pisano is Vice President of Finance and General
         Counsel of the Company. She is the sister-in-law of Mr. Leonard
         (footnote 1).

     (4) Prior to its acquisition by Essex, Mr. Katra was Executive Vice
         President and Chief Financial Officer and a founding shareholder of our
         wholly-owned subsidiary SDL and is currently employed by SDL. Of the
         shares shown as beneficially owned, 30,969 are owned jointly by Mr.
         Katra and his spouse.

     (5) Prior to its acquisition by Essex, Mr. Morsberger was Chief Technical
         Officer and a founding shareholder of our wholly-owned subsidiary SDL,
         and is currently employed by SDL. Of the shares shown as beneficially
         owned, 250 are owned by Mr. Morsberger's spouse.

     (6) Prior to its acquisition by Essex, Mr. Hilton was a Vice President and
         a founding shareholder of our wholly-owned subsidiary SDL, and is
         currently employed by SDL.

     (7) Prior to its acquisition by Essex, Mr. Brown was a Vice President and
         Corporate Secretary and a founding shareholder of our wholly-owned
         subsidiary SDL, and is currently employed by SDL.

     (8) Prior to its acquisition by Essex, Mr. Krauss was President of our
         wholly-owned subsidiary SDL, and is currently employed by SDL

     (9) Employees of SDL




                              PLAN OF DISTRIBUTION


         The Common Stock being offered by the selling stockholders may be sold
in transactions on the American Stock Exchange, on another market on which the
Common Stock may be trading, or in privately-negotiated transactions. The sale
price to the public may be the market price prevailing at the time of sale, a
price related to the prevailing market price or any other price the selling
stockholders may determine. The Common Stock may also be sold under SEC Rule 144
and not under this prospectus. The selling stockholders have the discretion not
to accept any purchase offer or make any sale of Common Stock if they deem the
purchase price to be unsatisfactory at any particular time, or for any reason.


         The selling stockholders may also sell the Common Stock directly to
broker-dealers acting as principals and/or to broker-dealers acting as agents
for themselves or their customers. Brokers acting as agents for the selling
stockholders will receive usual and customary commissions for brokerage
transactions, and broker-dealers acting as principals will do so for their own
account at negotiated prices and at their own risk. It is possible that the
selling stockholders will sell shares of Common Stock to broker-dealers or other
purchasers at a price per share which may be below the then market price. In
addition, the selling stockholders may enter into hedging transactions with
broker-dealers who may engage in short sales of Common Stock in the course of
hedging the positions they assume with a selling stockholder. The selling
stockholders also may sell shares short and deliver the shares to close out
their positions, and may loan or pledge their shares to a broker-dealer who may
have the right to sell the loaned or pledged shares on default or otherwise. The
selling stockholders and any brokers, dealers or agents, upon effecting the sale
of any of the Common Stock offered hereby, may be deemed "underwriters" as that
term is defined under the Securities Act or the Exchange Act, or the rules and
regulations thereunder.

         The selling stockholders and any other persons participating in the
sale or distribution of the Common Stock will be subject to applicable
provisions of the Exchange Act and its rules and regulations, which may limit
the timing of purchases and sales of any of the Common Stock by the selling
stockholders or other distribution participants. Furthermore, under Regulation
M, persons engaged in a distribution of securities are prohibited from
simultaneously engaging in market making and other activities with respect to
such securities for a specified period of time before the commencement of
distributions subject to specified exceptions or exemptions. This may affect the
marketability of the Common Stock. The Company is aware of the restrictions
imposed by Regulation M during distributions of securities by the selling
stockholders. The Company also has advised each of the selling stockholders of
their duties and obligations to comply with Regulation M and has requested that
each selling stockholder and its affiliated purchasers, if any, refrain from
bidding for or purchasing or inducing others to bid for or purchase common stock
during the five day restricted period in connection with any "distribution" of
common stock by such selling stockholders.

         We have agreed to indemnify the selling stockholders against some
important liabilities, including liabilities under the Securities Act, or to
contribute to any payments these selling stockholders may be required to make in
respect of these liabilities. We are paying the costs of this registration for
the selling stockholders.

                                       21



                                  LEGAL MATTERS

         The legal issuance and fully paid and non-assessable status of our
Common Stock offered by this prospectus was passed upon for us by our legal
counsel,  Whiteford,  Taylor & Preston L.L.P.,  Baltimore,  Maryland.  Counsel's
opinion is included as exhibit 5.1 to the  registration  statement of which this
prospectus is a part.

                                     EXPERTS

         The financial statements incorporated in this prospectus by reference
to our Annual Report on Form 10-KSB for the year ended December 29, 2002 have
been so incorporated in reliance on the report of Stegman & Company, independent
accountants, given on the authority of said firm as experts in auditing and
accounting.

         The historical financial statements of SDL as of September 30, 2002 and
for each of the two years in the period ended September 30, 2002 incorporated in
this prospectus by reference to our Current Report on Form 8-K filed on April
17, 2003, as amended by the Form 8-K/A filed on June 10, 2003, have been so
incorporated in reliance on the report of Stegman & Company, independent
accountants, given on the authority of said firm as experts in auditing and
accounting.

                                       22




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                                TABLE OF CONTENTS

             ------------------------------------------------------
             ------------------------------------------------------


                                                              PAGE
                                                            --------

      Where You Can Find More Information ..................   3
      Forward Looking Statements ...........................   4
      Essex Corporation ....................................   4
      Summary Financial Information ........................   5
      The Offering 6 Recent Developments ...................   6
      Risk Factors .........................................   7
      Our Products and Services ............................  17
      Use of Proceeds ......................................  18
      Selling Stockholders .................................  19
      Plan of Distribution .................................  21
      Legal Matters ........................................  22
      Experts ..............................................  22

             ------------------------------------------------------
             ------------------------------------------------------


                                ESSEX CORPORATION

                                  Common Stock

                            ------------------------
                                   PROSPECTUS

                            ------------------------
                                     , 2003

             ------------------------------------------------------
             ------------------------------------------------------





                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

         The following table sets forth the fees and expenses in connection with
the issuance and distribution of the securities being registered. Except for the
SEC registration fee, all amounts are estimates.


                                                         
SEC registration fee                                        $   735
Accounting fees and expenses                                  4,000
Legal fees and expenses                                      12,500
Blue Sky fees and expenses (including counsel fees)           2,500
Printing expenses                                               500
Transfer agent's and registrar's fees and expenses              500
Miscellaneous expenses                                          200
                                                            -------
  Total                                                     $20,935
                                                            =======


ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         The Virginia Stock Corporation Act ("Act") permits indemnification of
directors and officers of a corporation under certain conditions and subject to
certain limitations. Articles (h) and (i) of Essex's Articles of Incorporation
contain provisions for the indemnification of directors and officers of Essex
within the limitations permitted by the Act. In addition, Essex has entered into
indemnity agreements with all of its directors and officers which provide the
maximum indemnification allowed by the Act.

ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

     (a) Exhibits:

EXHIBIT
NUMBER                     DESCRIPTION

4.1   Specimen Stock Certificate*
5.1   Opinion of Whiteford, Taylor & Preston L.L.P.**
23.1  Consent of Independent Accountants
23.2  Consent of Independent Accountants
23.3  Consent of Whiteford, Taylor & Preston L.L.P. (included in Exhibit 5.1)**
24.1  Power of Attorney**
99.1  Securities Purchase Agreement dated March 15, 2001*



99.2  Amendment No. 2 to Registration Rights Agreement dated March 15, 2001*
99.3  Securities Purchase Agreement dated December 14, 2000*
99.4  Amendment No. 1 to Registration Rights Agreement dated December 4, 2000*
99.5  Securities Purchase Agreement dated September 7, 2000 among the Company,
      Global Optical Investment Company, LLC and Networking Ventures LLC. ***
99.6  Registration Rights Agreement dated September 7, 2000 among the Company,
      Global Optical Investment Company, LLC and Networking Ventures LLC***
99.7  Agreement and Plan of Merger among Essex Corporation, SDL Acquisition,
      Inc., Sensys Development Laboratories, Inc, and the Principal
      Shareholders dated as of February 21, 2003****
99.8  Registration Rights Agreement dated as of February 28, 2003 between
      Essex Corporation and Sensys Development Laboratories, Inc. Shareholders**
-----------------------
   * Incorporated by reference from the similarly numbered exhibit in the
     Company's Registration Statement on Form S-2 (333-61200).
  ** Previously filed.
 *** Incorporated by reference from Exhibit 99 to the Company's Form 8-K filed
     September 20, 2000.
**** Incorporated by reference from Exhibit 2.1 to the Company's Form 8-K filed
     March 7, 2003 .

     (b) Financial Statement Schedules.

         None.

ITEM 17.  UNDERTAKINGS.

         (a) The undersigned Registrant hereby undertakes:

                  (1) To file, during any period in which offers or sales are
                  being made, a post-effective amendment to this registration
                  statement:

                           (i) To include any prospectus required by Section
                  10(a)(3) of the Securities Act of 1933.

                           (ii) To reflect in the prospectus any facts or events
                  arising after the effective date of the registration statement
                  (or the most recent post-effective amendment to the
                  registration statement) which, individually or when viewed
                  together, represent a fundamental change in the information
                  set forth in the registration statement. Notwithstanding the
                  foregoing, any increase or decrease in volume of securities
                  offered (if the total dollar value of securities offered would



                  not exceed that which was registered) and any deviation from
                  the low or high end of the estimated maximum offering range
                  may be reflected in the form of prospectus filed with the
                  Commission pursuant to Rule 424(b) if, in the aggregate, the
                  changes in volume and price represent no more than a 20%
                  change in the maximum aggregate offering price set forth in
                  the "Calculation of Registration Fee" table in the effective
                  registration statement.

                           (iii) To include any material information with
                  respect to the plan of distribution not previously disclosed
                  in the registration statement or any material change to the
                  information in the registration statement. Provided, however,
                  that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
                  registration statement is on Form S-3 or Form S-8, and the
                  information required to be included in a post-effective
                  amendment by those paragraphs is contained in periodic reports
                  filed by the registrant pursuant to Section 13 or Section
                  15(d) of the Securities and Exchange Act of 1934 that are
                  incorporated by reference in the registration statement.

                  (2) That, for the purpose of determining any liability under
         the Securities Act, each of these post-effective amendments shall be
         deemed to be a new registration statement relating to the securities
         being offered, and the offering of those securities at that time shall
         be deemed to be their initial bona fide offering.

                  (3) To remove from registration by means of a post-effective
         amendment any of the securities being registered which remain unsold at
         the termination of the offering.

         (b) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities being offered, and the offering of those securities
at that time shall be deemed to be their initial bona fide offering.

         (c) Insofar as directors, officers and controlling persons of the
Registrant are permitted to seek indemnification for liabilities arising under
the Securities Act, under the foregoing provisions, or otherwise, the Registrant
has been advised that in the opinion of the Securities and Exchange Commission,
this indemnification is against public policy as expressed in the Securities Act
and is, therefore, unenforceable. In the event that a director, officer or
controlling person asserts a claim for indemnification against these types of
liabilities in connection with the securities being registered, other than the
payment by the Registrant of expenses incurred or paid by a director, officer or
controlling person of the Registrant in the successful defense of any action,
suit or proceeding, the Registrant will, unless in the opinion of its counsel
the matter has been settled by controlling precedent, submit to a court of
appropriate jurisdiction the question whether indemnification by it under these
circumstances is against public policy as expressed in the Securities Act and
will be governed by the final adjudication of the issue.




                                   SIGNATURES


         Pursuant to the requirements of the Securities Act, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-2 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the County of Howard, State of Maryland, on November 25, 2003.


                                     ESSEX CORPORATION


                                     By: /S/ LEONARD E. MOODISPAW
                                     ----------------------------------------
                                         Leonard E. Moodispaw
                                         President and Chief Executive Officer



         Pursuant to the requirements of the Securities Act, this Registration
Statement has been signed by the following persons in the capacities and on the
dates indicated.




SIGNATURE                                   TITLE                         DATE
                                                            
/S/ H. JEFFREY LEONARD*             Chairman of the Board         November 25, 2003
----------------------------
H. Jeffrey Leonard

/S/ LEONARD E. MOODISPAW            President, Chief Executive    November 25, 2003
---------------------------         Officer, and Director
Leonard E. Moodispaw                (principal executive officer)


/S/ JOSEPH R. KURRY, JR.            Chief Financial Officer       November 25, 2003
---------------------------         (principal financial and
Joseph R. Kurry, Jr.                accounting officer)


/S/ JOHN G. HANNON*                 Director                      November 25, 2003
---------------------------
John G. Hannon

/S/ ROBERT W. HICKS*                Director                      November 25, 2003
---------------------------
Robert W. Hicks

/S/ RAY M. KEELER *                 Director                      November 25, 2003
---------------------------
Ray M. Keeler

/S/ FRANK E. MANNING*               Director                      November 25, 2003
---------------------------
Frank E. Manning

/S/ MARIE S. MINTON*                Director                      November 25, 2003
---------------------------
Marie S. Minton

/S/ ATHUR L. MONEY*                 Director                      November 25, 2003
---------------------------
Arthur L. Money

/S/ TERRY M. TURPIN*                Director                      November 25, 2003
---------------------------
Terry M. Turpin



* pursuant to a power of attorney dated April 29, 2003 filed with this
Registration Statement (No. 333-104819)