opnet
Press release

OPNET Announces Resignation of Joseph F. Greeves

BETHESDA, MD - August 29, 2001 - OPNET Technologies, Inc. (Nasdaq:OPNT) announced today the resignation of its Chief Financial Officer, Joseph F. Greeves, who is leaving for personal reasons. ``We are grateful to Joe for his help in building OPNET and its financial organization,'' stated Marc A. Cohen, OPNET's Chairman and Chief Executive Officer. ``Joe has made many valuable contributions in the last three years, including helping to build a first-rate accounting and financial team. We wish Joe much continued success personally and professionally in the future.'' The company has initiated recruitment efforts for a new Chief Financial Officer. Until the position is filled, Suzanne Housman, OPNET's Controller for Consulting Services, has been appointed as acting Chief Financial Officer.

About OPNET Technologies, Inc.
Founded in 1986, OPNET Technologies, Inc. is the leading provider of intelligent network management software. The OPNET product suite combines predictive modeling and a comprehensive understanding of networking technologies to enable its customers to more effectively design and deploy networks, provision services, diagnose network and application performance problems, and predict the impact of network changes. For more information about OPNET and its products, visit www.opnet.com.

Safe Harbour Statement
The statements contained in this press release that are not purely historical are forward-looking statements within the meaning the Private Securities Litigation Reform Act of 1995, as amended, including statements regarding OPNET Technologies Inc.'s expectations, beliefs, intentions, or strategies regarding the future. All forward-looking statements included in this document are based upon information available to OPNET Technologies, Inc. as of the date hereof; OPNET Technologies, Inc. assumes no obligation to update any such forward-looking statements. Forward-looking statements involve risks and uncertainties, which could cause actual results to differ materially from those projected. For a discussion of such risks and uncertainties, see the Company's reports filed with the Securities & Exchange Commission, including its 10-Q for the quarter ended June 30, 2001.

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Note to editors: The word OPNET is spelled with all upper-case letters.


OPNET Media Contact:
Margarita Castillo
OPNET Technologies, Inc.
(240) 497-3000
Media@opnet.com
www.opnet.com

OPNET Investor Relations:
Mel Wesley
OPNET Technologies
(240) 497-3000
ir@opnet.com
www.opnet.com