As filed with the Securities and Exchange Commission on August 23, 2001
Registration No. 333 - 61200

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                              -------------------

                                 AMENDMENT NO. 3
                                       to
                                    FORM S-2
                             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) 953-8800

           (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 &
    9150 Guilford Road                                   Preston L.L.P.
   Columbia, Maryland  21046                           Seven Saint Paul Street
     (301) 939-7000                                  Baltimore, Maryland 21202
                                                                (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.









PROSPECTUS                        SUBJECT TO COMPLETION:        August __, 2001


                                ESSEX CORPORATION

                         785,000 Shares of Common Stock

         We have prepared this prospectus to allow some of our  stockholders and
         optionholders to sell up to 785,000 shares of our Common Stock.

         Our Common  Stock  trades on the OTC  Bulletin  Board  under the symbol
         "ESEX." On August __, 2001,  the last reported sale price of our Common
         Stock was $____ per share.

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

          INVESTING IN OUR COMMON STOCK INVOLVES A HIGH DEGREE OF RISK.
                     SEE "RISK FACTORS" BEGINNING ON PAGE 5.

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

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 August ___, 2001.

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.





                       WHERE YOU CAN FIND MORE INFORMATION

         We file annual,  quarterly and special  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.

         The SEC allows us to "incorporate by reference" the information we file
with them,  which means that we can  disclose  important  information  to you by
referring you to these documents.  The information  incorporated by reference is
an important part of this  prospectus,  and information  that we file later with
the SEC will automatically update and supersede this information. We incorporate
by reference the documents listed below and any future filings made with the SEC
under the Securities Exchange Act of 1934:

o Our Annual Report on Form 10-KSB for  the fiscal year ended December 31, 2000,
as amended by Form 10-KSB/A No. 2 filed on August 22, 2001.

o Our  Quarterly Report  on Form  10-QSB for  the fiscal  quarter ended April 1,
2001, as amended by Form 10-QSB/A No. 1 filed on August 22, 2001.

o Our Quarterly Report on Form 10-QSB for the fiscal quarter ended July 1, 2001.

o The  description of our Common Stock in our Form 8-A as it may be amended from
time to time.

         We are delivering  with this prospectus a copy of the Form 10-KSB/A No.
2, the Form 10-QSB/A No. 1 and 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.  You should not assume that the  information in this prospectus
is accurate  as of any date other than the date on the front of this  prospectus
or on any prospectus supplement that accompanies this prospectus.


                                        2



                           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.

                                        3



                                ESSEX CORPORATION

  References to "we," "us," "our" and "Essex" refer to Essex Corporation.

         Essex  is an  optical  and  digital  signal  processing  firm  that  is
developing   technologies,   components,   devices  and   systems   that  enable
next-generation  products in fast-growing  areas of the  telecommunications  and
microelectronics     industries:     fiber-optic     transmission,      wireless
telecommunications,   high-speed   optoelectronics   processors   and   advanced
semiconductor  chips. 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.

         Essex's  optoelectronics-engineering  team has  applied its optical and
digital   signal   processing   experience   to  critical   challenges   in  the
telecommunications  and advanced digital signal processing  fields. As a result,
Essex is  developing  three product lines that it believes have the potential to
provide dramatic  improvements in the speed,  cost  effectiveness and quality of
service for next-generation  systems in fiber-optic data transmission,  wireless
telecommunications and image processing.

         Essex  currently  does  not have  sufficient  resources  to  bring  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
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.  These companies are all larger and more  established  than
Essex, have existing customer bases and significantly  greater access to capital
resources than Essex. See "RISK FACTORS."

         Our products under development include:

o    An all-optical, all-passive technique, HyperFine Wavelength Division
     Multiplexing (HyperFine WDMTM), that has significantly increased the number
     of channels and their combined bandwidth used for dense wavelength division
     multiplexing (DWDM) in laboratory tests and prototype demonstrations.  We
     believe these characteristics will make HyperFine particularly suitable for
     long-haul, metro and local area data transmission.  In addition, other
     components in the HyperFine family of devices under various stages of
     development are designed to be integrated into products throughout optical
     networks at very low cost, including add/drop multiplexors, all-optical
     switching and bandwidth-on-demand systems.  If HyperFine is successfully
     developed and deployed, it will fulfill the promise of fiber to the home
     (FTTH) and fiber to the office (FTTO), as well as provide for many other
     applications requiring up to 4000 narrow band channels per strand of
     optical fiber.  We hope to have a demonstration Hyperfine device in
     potential customers' hands by late summer 2001.

                                        4



o    An optically enhanced digital signal processing technology, Optical
     Processor Enhanced Receiver Architecture (OPERATM), has demonstrated in
     laboratory modeling to dramatically increase the quality of service and
     carrying capacity for Code Division Multiple Access (CDMA) wireless
     telecommunications systems. The OPERA technology has the potential to
     revolutionize 2.5G and 3G CDMA systems, when deployed, by eliminating the
     "near-far" interference problem and allowing significantly more channels
     (users) per base station. Essex is currently in discussions with wireless
     industry representatives relating to the development of industry standards
     for the next generation of wireless technology. Thus, further development
     and testing of OPERA has been temporarily delayed until those industry
     standards are finalized.

o    A high-speed optoelectronics processor, Image Synthesis (ImSynTM), enabling
     extraordinarily fast processing of data for complex visual image systems
     including radar imaging, magnetic resonance imaging (MRI), microscopy and
     ultrawideband signal processing. The second generation ImSyn
     optoelectronics processor can accelerate computing speed for processing of
     large volumes of data by factors of up to one hundred times. Specifically,
     Essex has field tested a prototype ImSyn Processor with an MRI system and
     provided high speed images. Development of the second generation of ImSyn
     is taking place under a government contract for the development of advanced
     synthetic aperture radar techniques. We currently expect to complete the
     development and testing of second generation ImSyn processors in late 2001
     or early 2002.


                                        5




                                  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
2.

                     Risks Related to Our Financial Results

We have a history of net losses and expect to  continue  to incur net losses for
the foreseeable future, and may never achieve or sustain profitability.

         We  incurred  net  losses of $2.4  million  for our  fiscal  year ended
December 31, 2000. We also incurred net losses in fiscal 1998 and 1997. In 1999,
we had net income of $45,000. As of April 1, 2001, we had an accumulated deficit
of $9.1 million.  Our revenues have declined from $4.5 million in fiscal 1999 to
$3.3  million  in  fiscal   2000,   primarily  as  a  result  of  our  focus  on
optoelectronics   telecommunications  products  which  have  not  yet  generated
revenue.  For the quarter  ended April 1, 2001 we had revenue of $413,000  and a
net loss of $1.2 million.  We  expect to  incur net  losses for  the foreseeable
future.  To date, we have  primarily  funded  our  operations  from  the sale of
equity securities.  We also expect to incur significant product development  and
administrative  expenses,  and,  as a  result,  we will  need  to  significantly
increase revenues to achieve  profitability.  Even if we achieve  profitability,
given the  competition  in, and the evolving nature of, the optical and wireless
telecommunications   markets,  we  may  not  be  able  to  sustain  or  increase
profitability  on a  quarterly  or annual  basis.  As a result,  we will need to
generate  significantly  higher  revenues while  containing  costs and operating
expenses if we are to become and remain profitable.

If our actual capital requirements vary significantly from our expectations,  we
may require additional financing sooner than anticipated.

         Since September 2000 we have received  approximately  $3.7 million from
private investors to pursue commercial  applications of our optical and wireless
communications  technologies  and  resulting  products.  During the remainder of
2001,  these  private  investors  have  committed  to invest an  additional  (i)
$500,000 to purchase  125,000 common shares at $4.00 per share and (ii) $250,000
to purchase  62,500 shares of our preferred  stock.  These funds are critical to
our  ability to continue to develop our  commercial  technologies  and  products
because we currently  experience  and expect to continue to experience  negative
cash flows.  The funds  available  and  committed  are projected to last through
2001.  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.  There can be no  assurance  that such funding will be
available or could

                                        6



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.  Without
timely  financing,  we  would  have to  curtail  or  eliminate  development  and
immediately reduce expenditures.

                          Risks Related to our Business

The early stage of  development  of our optical and wireless  telecommunications
products makes it difficult to evaluate our business and prospects.

         Historically,  we have derived our revenues from providing  engineering
and signal processing  services to the U.S. Government and its prime contractors
as  well  as to  Motorola  for  work  on its  Iridium(R)  global  communications
satellite  system.  While we continue to provide these  services,  over the past
year we have increasingly  emphasized our work on developing new optoelectronics
telecommunications  products, including HyperFine WDM(TM) and OPERA(TM). Because
our  development  efforts on these  products  are  ongoing and we have not begun
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.  Further,  due to our shift in
focus,  we have  difficulty  accurately  forecasting  our  revenue,  and we have
limited historical  financial data upon which to base operating expense 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 in an early stage
of development in a new and rapidly-evolving industry.

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 2000, contracts with the U.S.  Government,  primarily the
military  services  and other  departments  and  agencies of the  Department  of
Defense (DoD),  accounted for approximately 73% or $2.4 million of our revenues.
In fiscal 1999,  revenues on U.S.  Government programs were $2.4 million, or 49%
of our revenues..  The reduction in revenues from  commercial  customers in 2000
has increased  dependence upon such government  program revenues.  Essex expects
such  government  program  revenues to be within a range of $2.5-3.0  million in
2001.  Our  business  with the DoD is focused  increasingly  on our  proprietary
optoelectronics  technology and products. Until we are able to generate revenues
from sales of our commercial  optoelectronics  telecommunication  products,  our
results of operations will continue to depend on sales to the DoD and other U.S.
Government  departments and agencies.  The loss of any significant contract or a
significant  reduction in or  cancellation  of these  contracts  would adversely
affect our revenues and impair our ability to continue  the  development  of our
proprietary communications products.

         The loss or  significant  reduction  in  government  funding of a large
program in which we  participate  could  also  materially  adversely  affect our
future sales, 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

                                        7


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  equipment and services
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.

         All 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.

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 22% and 24% of our sales for the year
ended December 31, 2000 and the first quarter of fiscal 2001, 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.

We may not successfully implement our plan to expand into commercial markets.

         Our revenues  currently  come from business with the DoD and other U.S.
Government agencies.  In addition to continuing to pursue these market areas, we
will focus our  technical  capabilities  and  expertise  on  related  commercial
markets,  including  HyperFine  WDM,  OPERA and ImSyn.  These products are still
under various stages of development and have not been  commercially  introduced.
As such, these products are subject to certain risks and may require us to:

                                        8



o        develop and maintain manufacturing, 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 our  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 degree on the
efforts of independent  distributors or communication service providers.  We can
give no assurance 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 these risks or in developing these commercial business  opportunities
we may not be able to reach profitability or remain in business.

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.  We have entered into  agreements  with our employees
that limit the employee's ability to work for a competitor following termination
of employment.  We expect our competitors  will respect these agreements and not
interfere  with them. We can make no assurances of that, or that we will be able
to retain all of our key  contributors  or attract  new  personnel  to add to or
replace them. The loss of key personnel would prevent us from completing current
development and restrict new development.

If broadband wireless technology or our implementation of this technology is not
broadly accepted, we will not be able to expand our business.

         The  future  success  of  OPERA  and  other  wireless  products  we are
currently  developing  depends on high-speed  wireless  communications  products
gaining  market  acceptance  as a means  to  provide  improved  voice  and  data
communications  services.  Because  these  markets  are  relatively  new,  it is
difficult to predict  which  market  segments  will  develop or expand.  We have
recently  invested  and  expect  to  continue  to  invest  significant  time and
resources in the development of new products for this market.  In the event that
service providers adopt  technologies other than the high-speed access and other
wireless  technologies  or delay  in their  deployment  of high  speed  wireless
communication  products,  we will not be able to generate  significant  revenues
from our wireless products and our results of operations and financial condition
could be materially and adversely affected.

                                        9




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 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.

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 business and
prospects.

         Our future growth and success largely depends on the commercial success
of our optical and wireless telecommunications products being developed. We have
not begun  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 and tested in our laboratories and 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.   If  our  customers  do  not
successfully test and deploy our products and  technologies,  we may not be able
to reach profitability or remain in business.

                                       10




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 large companies, such 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
communications  companies  who  may  enter  our  proposed  markets.  Many of our
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.  Moreover,  our
competitors may foresee the course of market  developments  more accurately than
we do and could  develop new  technologies  that  compete  with our  products or
render our products  obsolete.  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
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 Essex's Annual Report
on Form 10-KSB, as amended. The Form 10-KSB/A is incorporated in this prospectus
by  reference.  and we are  delivering a copy of the report  together  with this
prospectus.

                                       11



There is a risk that our patent applications will not be granted.

         Although we have filed several  applications  for U.S. patents relating
to our HyperFine WDM(TM) and OPERA(TM)  technologies,  there is a risk that some
or all of our  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  eliminate the  competitive  advantage we
hope to gain by  obtaining  patent  protection  and  thus  likely  would  have a
material adverse effect upon our business and results of operations.

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
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  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  would 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.

                                       12



                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 depends in large part on the widespread  adoption of next generation
optical   networks.   Communications   service   providers  that  have  invested
substantial resources in their existing optical networks or other systems may be
reluctant or slow to develop and deploy  next-generation  optical networks.  Our
success in  generating  revenues  in this  emerging  market  will  depend on our
ability to:

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.

The market for our HyperFine products under development is new and uncertain and
our business will suffer if it does not develop as we expect.

         Most  service  providers  have made  substantial  investments  in their
current  network  infrastructure,  and they may  elect to  remain  with  current
network  architectures  or to adopt new  architectures in limited stages or over
extended  periods of time.  A decision  by a customer  to  purchase  some of our
all-optical  products  under  development  will  involve a  significant  capital
investment.  We will need to convince these service providers of the benefits of
all-optical  network  products for future  network  upgrades or  expansions.  We
cannot be certain  that a viable  market  for our  products  will  develop or be
sustainable. If this market does not develop, or

                                       13



develops  more slowly than we expect,  our  business,  financial  condition  and
results of operations would be seriously harmed.

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 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.  If this
growth does not continue,  we may be unable to reach  profitability or remain in
business.

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 experience:

o loss of, or delay in,  revenue  and loss of market  share;  o loss of existing
customers;  o failure to attract new customers or achieve 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  would  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.

                                       14




                         Risks Related to this Offering

We are controlled by a limited number of stockholders that will be able to exert
significant influence over matters requiring stockholder approval.

         We  are  controlled  by  two  private  investment  firms,  GEF  Optical
Investment Company, LLC and Networking Ventures,  L.L.C. We refer to these firms
as the  "Investors."  Together the Investors  own preferred  stock having voting
rights  equivalent  to 51% of the voting  power of all shares of voting stock on
all stockholder  matters.  In addition,  the Investors have directly acquired or
contracted to acquire 660,000 shares of Common Stock. Accordingly, the Investors
will  control us and have the power to elect all of our  directors,  appoint new
management and approve 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  investors  might be
willing to pay for our Common Stock. The interests of the 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 is listed on the OTC  Bulletin  Board.  Prior to this
offering  there only has been a limited  public  market  for our  Common  Stock.
Unless and until our Common Stock is admitted for  quotation on the Nasdaq Stock
Market or listed on a  national  securities  exchange  it is  unlikely  that any
active trading market will develop or, if any such market develops, that it will
be  sustained.  Even if our Common Stock is admitted for quotation or listing on
Nasdaq or a  national  securities  exchange,  an active  trading  market may not
develop unless 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 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.

                                       15



         We have outstanding  4,955,961  shares of our Common Stock,  535,000 of
which were  issued  and sold by us in  private  transactions  in  reliance  upon
exemptions from registration  under the Securities Act. Other than the shares of
Common Stock covered by this prospectus,  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  Investors
have been granted rights to have up to 4,000,000 shares of Common Stock issuable
upon conversion of preferred stock and underlying  warrants registered under the
Securities Act upon demand.  Sales of substantial  amounts of Common Stock under
Rule 144 or pursuant to the Investor'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




                                 USE OF PROCEEDS

         We will not receive any  proceeds  from the sale of the Common Stock by
the selling stockholders.  We may receive a small amount of proceeds if and when
an  optionholder  exercises  the  option  that it holds  and we will  use  those
proceeds for general corporate purposes.

                              SELLING STOCKHOLDERS

         This  prospectus  relates  to  the  offering  by the  stockholders  and
optionholder  named in the  prospectus  for  resale of up to  785,000  shares of
Common Stock. Throughout this prospectus, we may refer to these stockholders and
optionholder  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 following table sets forth the following  information  with respect
to each  selling  stockholder  as of June 30,  2001:  (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 owns 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.





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


                                                                                        
H. Jeffrey Leonard (1)     2,691,500               38.0                  2,029,500                  28.7
Caroline S. Pisano (2)     2,666,000               37.7                  2,006,000                  28.4
John G. Hannon (3)         2,660,225               37.6                  2,000,225                  28.3
James P. Gregory (4)       2,660,000               37.6                  2,000,000                  28.3
Marie S. Minton (5)        2,660,000               37.6                  2,000,000                  28.3
GEF Optical Investment
  Company, LLC (6)(7)      2,660,000               37.6                  2,000,000                  28.3
Networking
  Ventures, L.L.C. (7)(8)  2,660,000               37.6                  2,000,000                  28.3
Nottingham Investment
  Company (9)                125,000                2.6                     -0-                     -0-


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


     (1)  H. Jeffrey Leonard is Chairman of the Board of Essex and a director of
          the managing member of GEF. Of the shares shown as beneficially owned,
          31,500 are owned  directly by Mr.  Leonard and 2,660,000 may be deemed
          to be beneficially  owned by Mr. Leonard as described in footnotes (6)
          and (8) below.  Mr.  Leonard's  address is c/o GEF,  1225 Eye  Street,
          N.W., Suite 900, Washington, DC 20005.

     (2)  Caroline  S.  Pisano is a Director  of Essex and a managing  member of
          Networking Ventures.  Of the shares shown as beneficially owned, 6,000
          are owned directly by Ms. Pisano and 2,660,000 shares may be deemed to
          be beneficially  owned by Ms. Pisano as described in footnotes (7) and
          (8) below.  Ms.  Pisano's  address is c/o  Networking  Ventures,  9150
          Guilford Road, Columbia, MD 21046-189l.

                                       17



     (3)  John G.  Hannon  is a  Director  of Essex  and a  managing  member  of
          Networking  Ventures.  Of the shares shown as beneficially  owned, 225
          are owned directly by Mr. Hannon and 2,660,000 shares may be deemed to
          be beneficially  owned by Mr. Hannon as described in footnotes (7) and
          (8) below.  Mr.  Hannon's  address is c/o  Networking  Ventures,  9150
          Guilford Road, Columbia, MD 21046-189l.

     (4)  James P.  Gregory is a director  of the  managing  member of GEF.  Mr.
          Gregory may be deemed to be the  beneficial  owner of these  shares by
          virtue of the  arrangements  described in footnotes (6) and (8) below.
          Mr.  Gregory's  address is c/o GEF, 1225 Eye Street,  N.W., Suite 900,
          Washington, DC 20005.

     (5)  Marie S. Minton is a Director of Essex and a director of the  managing
          member of GEF. Ms. Minton may be deemed to be the beneficial  owner of
          these shares by virtue of the arrangements  described in footnotes (6)
          and (8) below. Ms. Minton's address is c/o GEF, 1225 Eye Street, N.W.,
          Suite 900, Washington, DC 20005.

     (6) Consists of 1,000,000  shares of Common Stock issuable upon  conversion
         of 250,000 shares of Preferred  Stock and 330,000 shares directly owned
         by GEF. Also consists of 1,000,000  shares of Common Stock  issuable on
         conversion  of 250,000  shares of  Preferred  Stock and 330,000  shares
         directly  owned  by  Networking  Ventures,  by  virtue  of  the  voting
         arrangements described in footnote (8) below. GEF is a Delaware limited
         liability company with its principal  executive offices located at 1225
         Eye Street, N.W., Suite 900, Washington, DC 20005.

     (7) Consists of 1,000,000  shares of Common Stock issuable upon  conversion
         of 250,000 shares of Preferred  Stock and 330,000 shares directly owned
         by Networking  Ventures.  Also  consists of 1,000,000  shares of Common
         Stock issuable on conversion of 250,000  shares of Preferred  Stock and
         330,000  shares  directly  owned  by  GEF,  by  virtue  of  the  voting
         arrangements described in footnote (8) below.  Networking Ventures is a
         Maryland limited liability company with its principal executive offices
         located at 9150 Guilford Road, Columbia, MD 20146-1891.

    (8)  Based on a Schedule 13D/A filed with the SEC on December 14, 2000, each
         of GEF, Mr. Leonard, Ms. Minton, Mr. Gregory, Networking Ventures, Mr.
         Hannon and Ms. Pisano may be deemed the beneficial owner of 2,000,000
         shares of Common Stock issuable upon conversion of 500,000 shares of
         Preferred Stock and a total of 660,000 shares of Common Stock
         beneficially owned by GEF and Networking Ventures by virtue of the
         provisions of a Shareholders Voting Agreement between GEF and
         Networking Ventures providing for certain voting arrangements with
         respect to such shares. A copy of the Shareholders Voting Agreement is
         included as Exhibit 3 to the Schedule 13D/A.

    (9)  Consists of options  exercisable  for 125,000  shares of Common  Stock.
         Nottingham  Investment  Company  is a  Maryland  corporation  with  its
         principal  executive offices located at 100 West  Pennsylvania  Avenue,
         Towson, Maryland 21204.




                                       18




                              PLAN OF DISTRIBUTION

         The Common Stock being offered by the selling  stockholders may be sold
in transactions on the OTC Bulletin Board, 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.  No sales  under  Rule  144 can be made  until
December  5,  2001,  which is one  year  after  the  earliest  date the  selling
stockholders  acquired their shares from us. 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.

         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.

                                       19




                                  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/A No. 2 for the year ended December 31, 2000
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.

                                       20





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

                                TABLE OF CONTENTS

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


                                      PAGE
                                    --------

    Where You Can Find More
     Information........................................................... 2
    Forward Looking Statements............................................. 3
    Essex.................................................................. 4
    Risk Factors........................................................... 5
    Use of Proceeds....................................................... 17
    Selling Stockholders.................................................. 17
    Plan of Distribution.................................................. 19
    Legal Matters......................................................... 20
    Experts............................................................... 20


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


                                ESSEX CORPORATION

                                  Common Stock
                            ------------------------
                                   PROSPECTUS
                            ------------------------
                                 August __, 2001

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

                                       21





                                     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................................................$       854
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.............................................................    $21,054
                                                                        =======



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
23.3    Consent of Whiteford, Taylor & Preston L.L.P. (included in Exhibit 5.1)
24      Power of Attorney*
99.1    Securities Purchase Agreement dated March 15, 2001*

                                      II-1



99.2    Amendment No. 2 to Registration Rights Agreement dated March 15, 2001*
99.3    Securities Purchase Agreement dated December 4,  2000*
99.4    Amendment No. 1 to Registration Rights Agreement dated December 4, 2000*

-----------------------
*  Previously filed

     (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.

                                      II-2



                  (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.

                                      II-3





                                   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 Columbia, State of Maryland, on August 22, 2001.

                                   ESSEX CORPORATION


                                   By: /s/ Leonard E. Moodispaw
                                   ----------------------------------------
                                   Leonard E. Moodispaw
                                   President and Chief Executive Officer

                                      II-4




         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             August 22, 2001
----------------------------
H. Jeffrey Leonard


/s/ Leonard E. Moodispaw       President, Chief Executive        August 22, 2001
---------------------------    Officer, and Director
Leonard E. Moodispaw           (principal executive officer)


/s/ Joseph R. Kurry, Jr.       Chief Financial Officer           August 22, 2001
---------------------------    (principal financial and
Joseph R. Kurry, Jr.           accounting officer)


                               Director                         August __, 2001
---------------------------
John G. Hannon


/s/ Robert W. Hicks*           Director                          August 22, 2001
---------------------------
Robert W. Hicks


/s/ Ray M. Keeler*             Director                          August 22, 2001
---------------------------
Ray M. Keeler

                               Director                         August __, 2001
---------------------------
Frank E. Manning


/s/ Marie S. Minton*           Director                          August 22, 2001
---------------------------
Marie S. Minton


/s/ Caroline S. Pisano*        Director                          August 22, 2001
---------------------------
Caroline S. Pisano


/s/ Terry M. Turpin*           Director                          August 22, 2001
---------------------------
Terry M. Turpin


* pursuant  to a power of  attorney  dated May 17, 2001 filed with Form S-3 (No.
333-61200)


                                      II-5