ManTech International Corp.

Mr. Kelley is the President of ManTech’s Space Systems business unit. Mr. Kelley joined ManTech in April 2003 and was appointed to his current position in April 2004. Previously he was Vice President of Mid-West Operations for ManTech. Before joining ManTech, Mr. Kelley served over 37 years with the United States Air Force, retiring as a Lieutenant General. He was a “charter” member of Toffler Associates, and he has additional professional experience as the chief operating officer for STA, Inc., and later, the Vice President for Military Programs for Lockheed Martin Technical Operations.

Mr. Fox is President of ManTech Information Systems and Technology (IS&T). Mr. Fox was named President of IS&T in September 2004. Prior to that, he served as Senior Vice President of IS&T. Before joining ManTech, Mr. Fox was a Vice President of Integrated Data Systems Corporation (IDS), a highly regarded provider of software engineering, computer security and enterprise architecture solutions to the Intelligence Community and the Department of Defense that had revenues of approximately $40 million at the time it was acquired by ManTech. He joined IDS in 1991, and was responsible for software development activities, business development and strategic planning. IDS was acquired by ManTech in February 2003.

Mr. Addeo is President of our Defense Systems Group (DSG). Mr. Addeo joined ManTech in March 2009. Prior to joining ManTech, from September, 2007 until January, 2009, Mr. Addeo served as chief operating officer of Serco, North America, a subsidiary of Serco Group, a 40,000 person organization operating in 30 countries. From 2001 to 2006, Mr. Addeo served as the President of AT&T Government Solutions, a $1.5 billion business segment providing a broad array of complex business IT and services solutions to federal, civilian, DoD and the intelligence community customers. Mr. Addeo previously served in a variety of other capacities during his almost 30-year tenure with AT&T.

Mr. Coleman is currently the President and Chief Operating Officer of ManTech. Mr. Coleman was named President and Chief Operating Officer of the Company in September 2004 and was elected as a Director of the Company in March 2006. Prior to that, he was the President of ManTech s Information Systems and Technology business unit. Before joining ManTech, Mr. Coleman was the founder, CEO and President of Integrated Data Systems Corporation, a highly regarded provider of software engineering, computer security and enterprise architecture solutions to the Intelligence Community and the Department of Defense, which ManTech acquired in February 2003. In March 2009, Mr. Coleman announced his resignation effective on or about June 1, 2009, and expressed his intent to remain a member of the Board of Directors.

Kevin M. Phillips. Mr. Phillips is the Chief Financial Officer of ManTech International Corporation. Prior to being named Chief Financial Officer, Mr. Phillips served as Corporate Vice President and Chief of Staff for ManTech, in which capacity he played an active role in the integration of acquisitions and other strategic business issues. Mr. Phillips joined ManTech in February 2003. He was formerly the Chief Financial Officer of CTX Corporation, a leading provider of information technology and software strategies and solutions to the national Intelligence Community that had revenues of approximately $35 million at the time it was acquired by ManTech in December 2002. Mr. Phillips spent seven years in the executive management of CTX Corporation. Prior to that, he held various roles including controllerships in IT services providers to the government.

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Admiral Jeremiah has served as a Director of ManTech since 2004. From 1994 to 2005, Adm. Jeremiah served on our Advisory Board. Admiral Jeremiah currently serves as Chairman of Technology Strategies & Alliances Corporation, a strategic advisory and investment banking firm engaged primarily in the aerospace, defense, telecommunications, and electronics industries. Admiral Jeremiah serves on the board of directors for Todd Shipyards Corporation, a NYSE-listed company engaged in shipbuilding, ship overhaul, conversion and repair in the United States. During his military career, Adm. Jeremiah earned a reputation as an authority on strategic planning, financial management and the policy implications of advanced technology. From 1990 to 1994, Adm. Jeremiah served as Vice Chairman of the Joint Chiefs of Staff for Generals Powell and Shalikashvili.

Ms. Bush has served as a Director of ManTech since 2006. Ms. Bush founded Bush International, a global consulting firm in 1991. From 1989 to 1991, Ms. Bush served as Managing Director and Head of the Federal Housing Finance Board, the oversight body for the nation s 12 Federal Home Loan Banks. Prior to 1989, Ms. Bush was the Vice President and Head of International Finance at the Federal National Mortgage Associate (Fannie Mae). From 1982 to 1984, Ms. Bush served as U.S. Alternate Executive Director of the International Monetary Fund (IMF), a position appointed by the President of the United States and confirmed by the Senate. In that capacity, she worked with the U.S. Treasury Department to formulate policy on IMF lending and global economic matters. Ms. Bush serves on the board of directors of The Pioneer Family of Mutual Funds, Briggs & Stratton Corporation, Discover Financial Services, Marriott International, Inc and UAL Corporation (United Airlines).

Mr. Porter has served as a Director of ManTech since 1991. Mr. Porter is Senior Counsel with the law firm of Arnold & Porter, where he has practiced law since June 1993, focusing on real estate, tax and corporate law. Mr. Porter became a certified public accountant in 1961. Mr. Porter currently serves on the Executive Committee of the Greater Washington Board of Trade and is Immediate Past Chairman of the Board of the District of Columbia Chamber of Commerce. From 1992 to 1994, he served as a member of the Advisory Board of the Center for Strategic and International Studies, a non-partisan public policy institute.