ManTech International Corporation Names L. William Varner President of its Mission, Cyber & Technology Solutions Group

ManTech International Corporation (Nasdaq:MANT) has named L. William Varner president of its Mission, Cyber & Technology Solutions Group, which is being created through a combination of the company’s Information Systems & Technology, and Security & Mission Assurance Groups. Mr. Varner is joining ManTech International Corporation from Northrop Grumman TASC, where he was the Vice President, Corporate Officer, and Executive Director of the Intelligence Operating Unit. Mr. Varner has had a distinguished career of over 30 years with TASC, and previously he was with ESL, Inc.

"It gives me great pleasure to welcome Bill Varner to the ManTech team as his extensive experience and expertise in the Intelligence Community market and systems engineering will be critical in helping us achieve our growth goals over the next several years," said George J. Pedersen, Chairman of the Board and Chief Executive Officer, ManTech International Corporation. "Bill will be a key member of the senior management team, and we look forward to working with him as we continue to make ManTech the premier mid-tier national security firm in the marketplace."

Lawrence B. Prior, III, ManTech's President and Chief Operating Officer, stated "Bill is a unique people-focused leader with great history and insight into the needs of the Intelligence Community and has a proven track record of growth. Bill’s commitment to mission and deep domain expertise will help us serve our customers across the federal government, and during this dramatic change in our industry, he will leverage and expand our market leading computer network operations for the nation’s critical cyber challenges. We are very excited to have Bill join our team as the national security community makes important improvements in managing organizational conflicts of interest (OCI). He will provide exceptional leadership and advisory support to our customers.”

"I am excited to join the ManTech management team and help build upon ManTech's exceptional 40-year track record," said L. William Varner, President, ManTech Mission, Cyber & Technology Solutions Group. "ManTech’s mission-driven culture and focus on U.S. national security is a great differentiator and I see significant opportunities for growth within our markets."

Before joining ManTech International Corporation, Mr. Varner was a core member of the senior executive team that grew Northrop Grumman TASC to approximately $2 billion in annual revenues. In his role as Vice President, he led over 1,000 employees in the Intelligence Operating Unit in delivering leading-edge and innovative technical solutions and operations support to the Defense and Intelligence Communities. While at TASC, Mr. Varner led his team to achieve their first corporate Capability Maturity Model Integration (CMMI) Level 5 Certification in software development, as well as leading several multi $100 million strategic proposal wins. Before joining TASC, Mr. Varner was with ESL, Inc. Mr. Varner is a graduate of George Washington University (BSEE with Special Honors), Purdue University (MSEE), and Virginia Polytechnic Institute and State University (MBA). Mr. Varner also has advanced studies certificates from the University of Pennsylvania Wharton School (Financial Management), Harvard University (Management), and the University of Virginia Darden School (Leadership), and the California Institute of Technology (Technology Management).

About ManTech International Corporation:

Headquartered in Fairfax, Virginia with over 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 consolidation; 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.