ManTech International Corporation Names Sally Sullivan, Executive Vice President, Business Development

Most Recently Vice President, Defense, Space & Secured Infrastructure, Bechtel
National, Inc.
FAIRFAX, Va.--(Business Wire)--
ManTech International Corporation(Nasdaq:MANT) has named Sally Sullivan,
Executive Vice President, Business Development, to lead the company`s business
growth supporting customers in the Department of Defense (DoD), Intelligence
Community and throughout the federal government. Ms. Sullivan has a 27-year
track record of successfully developing, implementing and managing complex
solutions for the government on a global basis.

Ms. Sullivan joins ManTech from Bechtel National, Inc., where she was the Vice
President for Defense, Space & Secured Infrastructure, responsible for growing
business with DoD, the Intelligence Community, key federal civil agencies and
select foreign governments. This included the design and delivery of complex
operational systems and infrastructures as well as specialized services such as
government owned/contractor operated facilities, environmental remediation,
chemical/nuclear demilitarization and new counterterrorism technologies and
interagency response capabilities. Prior to joining Bechtel, she was the Sector
Vice President for Business Development of Northrop Grumman Mission Systems,
where she had responsibility for the growth and development of the unit`s $6
billion Command, Control, Communications, Computers, Intelligence, Surveillance
and Reconnaissance (C4ISR) business and directed its advanced capabilities
demonstration lab. Her portfolio spanned missiles, missile defense, and C4ISR,
and she was the corporate lead executive for key customers such as the Joint
Forces Command, U.S. Northern Command, U.S. Air Force Space Command, U.S. Army
Training and Doctrine Command, Missile Defense Agency and NASA.

"It gives me great pleasure to welcome Ms. Sullivan to ManTech. Her extensive
customer-focused experience and expertise in our markets and other governmental
areas 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. "Ms. Sullivan will be a key member
of our executive management team, and we look forward to working with her as we
continue to drive our successful performance and make ManTech the premier
mid-tier national security firm in the marketplace."

Lawrence B. Prior III, ManTech's President and Chief Operating Officer, said,
"Sally is a respected leader in our marketplace and her depth of experience and
record of success will help ensure that our business development strategy aligns
with our long-term growth plans while remaining focused on our customers`
critical missions. Her enterprise-wide business development approach will
magnify our recent wins in DHS and cyber, and she will enhance ManTech`s market
differentiators and expand our market presence. We are delighted to have Sally
join our team."

"I am excited to join ManTech`s exceptional management team and help build and
align our customer-focused company-wide strategy to continue ManTech's record of
41-plus years of successful growth," said Ms. Sullivan, Executive Vice
President, Business Development, ManTech International Corporation. "As I look
out over the industry, ManTech is a market leader in cyber Computer Network
Operations as well as C4ISR and logistics and is well-positioned to take
advantage of changes in our marketplace. ManTech`s customer mission-driven
culture and focus on employees and shareholders is a great differentiator, and I
see significant market opportunities for growth and ensuring that our customers`
goals are met with every program we support."

Before joining Northrop Grumman, Ms. Sullivan was Executive Director for the
Public Sector division of ChoicePoint, Inc. and in three years took the
organization from a startup to becoming the preeminent player in the government
automated public records market. She began her career at EDS where she held key
roles of increasing responsibility over a 17-year period. Ms. Sullivan led the
teams that conceived, developed and deployed some of the first-ever healthcare
systems used in medical readiness, transport and logistics. She managed and
directed an operational staff of several hundred engineers and communications
experts responsible for the development and worldwide deployment of these
solutions.

Ms. Sullivan earned a Bachelor of Science degree from Texas Tech University in
1980. She serves on the Advisory Board of CharityWorks, a high impact
organization that unites corporate leaders and donors in partnership with
Washington Metropolitan area non-profit organizations to address the health,
education and poverty of children. She is also the Board Chair of The Fishing
School, an after-school safe-haven and educational support center for vulnerable
children.

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
Mark Root
Executive Director, Corp. Communications
703-218-8397; cell: 571-259-1169
mark.root@mantech.com
or
Stuart Davis
Corporate EVP, Strategy and IR
703-218-8269; cell: 703-677-5248
stuart.davis@mantech.com

Copyright Business Wire 2009