Tim Castle joined the CIA's Center for the Study of Intelligence (CSI) in August 2006 following a tour with the Office of the Director of National Intelligence (ODNI) where he established and directed the Intelligence Community Lessons Learned Center. Before his service with the ODNI, Dr Castle was Professor of National Security Affairs and Director, Security, Strategy, and Forces, at the U.S. Naval War College. Prior government responsibilities include Deputy Chairman, Department of Warfighting, U.S. Air War College, and Chief, Southeast Asia Archival research, POW-MIA, in the Office of the Secretary of Defense. His areas of specialization are Modern Southeast Asia, U.S. Foreign Policy, and Special Operations.

Dr Castle is a career intelligence officer with wide-ranging Asia experience, including two wartime tours in Southeast Asia. While serving as an enlisted man at Nakhon Phanom Air Base he participated in 38 combat support missions with the 21st Special Operations Squadron and received the Airman's Medal for heroism in the rescue of a crashed and injured pilot.

Dr. Castle currently directs CIA efforts to develop lessons learned on counterterrorism and military programs and has been a frequent traveler to the warzones.

He is the author of One Day Too Long: Top Secret Site 85 and the Bombing of North Vietnam, Columbia University Press, 1999, selected by the Chief of Staff of the Air Force for inclusion on the 2009 USAF Professional reading list, and At War in the Shadow of Vietnam: United States Military Assistance to Royal Lao Government, 1955-1975, Columbia University Press, 1993.