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

"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.

SOURCE: ManTech International Corporation

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