ManTech International Corporation Names M. Stuart Davis as Executive Vice President, Strategy

Most Recently Corporate Senior Vice President of Investor and Employee Owner
Relations for Science Applications International Corporation (SAIC)
FAIRFAX, Va.--(Business Wire)--
ManTech International Corporation(Nasdaq:MANT) has named M. Stuart Davis
Corporate Executive Vice President, Strategy, a position being created to help
align ManTech`s strategic growth in corporate-wide markets and campaigns
supporting our investors, customers and employees. Mr. Davis is joining ManTech
from SAIC, where he was the Corporate Senior Vice President of Investor and
Employee Owner Relations. Mr. Davis has had a distinguished career of more than
25 years with organizations such as SAIC and SRA International, Inc.

"It gives me great pleasure to welcome Stuart to the ManTech management team as
his extensive experience and expertise in our markets and his focus on investors
will be critical in helping us achieve our multi-year strategic growth goals,"
said George J. Pedersen, Chairman of the Board and Chief Executive Officer,
ManTech International Corporation. "Stuart will be a key member of our senior
management team, and we look forward to working with him as we continue to make
ManTech the premier mid-tier government services firm in the marketplace."

Lawrence B. Prior, III, President and Chief Operating Officer, ManTech
International Corporation, said, "Stuart has the best strategic mind in our
market. He brings extensive experience with the investor community and has a
proven track record of communications success. His focus on a defined and
quality approach for establishing market differentiators, communications
strategy and delivering financial results to the investment community will
benefit our stockholders and customers. Stuart will leverage and expand our
market leadership in supporting the nation`s most critical challenges. We are
very excited to have Stuart join our team as the lead for strategy to expand
ManTech`s position in the marketplace."

"I am excited to join ManTech`s exceptional management team and help build a
multi-year strategy to continue ManTech's over 40-year history of successful
growth," said M. Stuart Davis, Executive Vice President, Strategy, ManTech
International Corporation. "ManTech`s mission-driven culture and focus on its
customers is a great differentiator and I see significant market opportunities
for growth and returns to ManTech`s shareholders."

Joseph Cormier, Corporate Senior Vice President, Corporate Development, ManTech
International Corporation, will transition the investor relations function to
Mr. Davis and will focus exclusively on the company`s strategic acquisition
program, which he has led since 2005. Mr. Prior said, "Joe has been a key
contributor to the growth of the organization. He is a proven competitor with
deep financial and negotiating acumen and his intensity will help drive our M&A
program in alignment with our business strategy. Teamed with George Pedersen, we
have the best team in the market for acquisitive growth."

Before joining ManTech, Mr. Davis was a core member of the senior management
team that led the marketing efforts for SAIC's initial public offering and
defined the company`s approach and process for communicating strategy, financial
results and market differentiators to the investment community. As Corporate
Senior Vice President at SAIC he built the Investor Relations program from
inception, including establishing a company-wide philosophy for communication
and branding materials, and strategic processes. Before joining SAIC in 2006,
Mr. Davis held a number of key financial positions in a career spanning more
than 21 years at SRA. In his last position at SRA, Mr. Davis was Vice President
and Director of Investor Relations. He formed and led the Investor Relations
department through the company`s initial public offering, secondary offering,
and two-for-one stock split. Mr. Davis received a Bachelor of Arts degree in
economics and philosophy from Cornell University and a Master of Science degree
in economics from the London School of Economics and Political Science.

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

Copyright Business Wire 2009