ManTech International Corporation Names Melissa Hathaway, Former Senior Director for Cyberspace, as a Strategic Consultant

FAIRFAX, Va.--(Business Wire)--
ManTech International Corporation(Nasdaq:MANT) announced today that Melissa
Hathaway, President of Hathaway Global Strategies, LLC and former Acting Senior
Director for Cyberspace for the National and Homeland Security Councils, and
former Senior Advisor and Cyber Coordination Executive for the Director of
National Intelligence, has joined ManTech's Cyber Council to provide strategic
guidance on Cybersecurity issues affecting national security.

"We are extremely pleased that Melissa Hathaway has agreed to assist ManTech in
supporting this critical national and economic security mission," said George J.
Pedersen, ManTech Chairman and Chief Executive Officer. "Her expertise in
understanding the threat and thought leadership on global Cybersecurity issues
will be a great addition to our team."

"ManTech already has outstanding Cybersecurity capabilities and we support
critical Intelligence Community, Department of Defense, and Civilian government
missions," said Larry Prior, ManTech President and Chief Operating Officer.
"Gaining Melissa's strategic counsel will help us expand our footprint and
strategically enable us to support new missions, customers, and markets."

"ManTech understands the threats facing our public and private sector networks
and has an outstanding reputation as a high-end, innovative Cybersecurity
solutions provider to the Intelligence Community and Federal Government," said
Ms. Hathaway. "I look forward to working with ManTech's corporate leadership and
assisting them in bringing strategic focus to their Cybersecurity efforts."

About ManTech International Corporation:

Headquartered in Fairfax, Virginia with approximately 8,000 professionals,
ManTech International Corporation is a leading provider of innovative
technologies and solutions for mission-critical national security programs for
the Intelligence Community; the departments of Defense, State, Homeland Security
and Justice; the Space Community; National Oceanic and Atmospheric
Administration; and other U.S. federal government customers. ManTech`s expertise
includes systems engineering, systems integration, software development
services, enterprise architecture, cyber security, information assurance,
intelligence operations and analysis support, network and critical
infrastructure protection, information operations and information warfare
support, information technology, communications integration, global logistics
and supply chain management, and service oriented architectures. The company
supports the advanced telecommunications systems that are used in Operation
Iraqi Freedom and in other parts of the world; has developed a secure,
collaborative communications system for the U.S. Department of Homeland
Security; and builds and maintains secure databases that track terrorists. The
company operates in the United States and 40 countries. In 2008, BusinessWeek
magazine chose ManTech for its `InfoTech 100` listing representing the best
performing tech companies in the world; Forbes.com named ManTech as one of the
400 Best Big Companies in the nation; and A-Space, a Web 2.0 enhanced
collaboration tool that ManTech developed for the Intelligence Community was
named one of the Top 50 Inventions of the Year by Time magazine. Also in 2008,
GI Jobs magazine named ManTech a Top Ten Military Friendly Employer for the
third year in a row. Additional information on ManTech can be found at
www.mantech.com.

Forward-Looking Information:

Statements and assumptions made in this press release, which do not address
historical facts, constitute "forward-looking" statements that ManTech believes
to be within the definition in the Private Securities Litigation Reform Act of
1995 and involve risks and uncertainties, many of which are outside of our
control. Words such as "may," "will," "intends," "should," "expects," "plans,"
"projects," "anticipates," "believes," "estimates," "predicts," "potential,"
"continue," or "opportunity," or the negative of these terms or words of similar
import are intended to identify forward-looking statements.

These forward-looking statements are subject to known and unknown risks and
uncertainties, which could cause actual results to differ materially from those
anticipated, including, without limitation: adverse changes in U.S. government
spending priorities; failure to retain existing U.S. government contracts, win
new contracts, or win recompetes; adverse results of U.S. government audits of
our government contracts; risks associated with complex U.S. government
procurement laws and regulations; adverse effect of contract consolidations;
risk of contract performance or termination; failure to obtain option awards,
task orders or funding under contracts; adverse changes in our mix of contract
types; failure to successfully integrate recently acquired companies or
businesses into our operations or to realize any accretive or synergistic
effects from such acquisitions; failure to identify, execute or effectively
integrate future acquisitions; risks of financing, such as increases in interest
rates and restrictions imposed by our credit agreement; risks related to an
inability to obtain new or additional financing; and competition. These and
other risk factors are more fully discussed in the section entitled "Risks
Factors" in ManTech's Annual Report on Form 10-K filed with the Securities and
Exchange Commission on February 27, 2009, and, from time to time, in ManTech's
other filings with the Securities and Exchange Commission, including among
others, its reports on Form 10-Q.

The forward-looking statements included in this news release are only made as of
the date of this news release and ManTech undertakes no obligation to publicly
update any of the forward-looking statements made herein, whether as a result of
new information, subsequent events or circumstances, changes in expectations or
otherwise.

ManTech International Corporation
Joseph Cormier
Senior Vice President, Corporate Development
703-218-8258
joe.cormier@mantech.com
or
Mark Root
Executive Director, Corporate Communications
703-218-8397; cell: 571-259-1169
mark.root@mantech.com

Copyright Business Wire 2009