Stephen D. Biddle is a senior fellow for Defense Policy at the Council on Foreign Relations. Before joining the Council in January 2006, Dr. Biddle served as Associate Professor and Elihu Root Chair of Military Studies at the U.S. Army War College Strategic Studies Institute (SSI). His areas of expertise include U.S. national security policy, military strategy and the conduct of war, technology in modern warfare, and recent operations in the war on terror.

Dr. Biddle has previously held teaching and research positions at the University of North Carolina at Chapel Hill; the Institute for Defense Analyses (IDA) in Alexandria, Virginia; Harvard University’s Belfer Center for Science and International Affairs (BCSIA); and the Kennedy School of Government's Office of National Security Programs. He has served as U.S. Representative to the NATO Defense Research Group study on Stable Defense, and has testified before congressional committees on issues relating to Operation IRAQI FREEDOM, conventional net assessment, and European arms control. He is a member of the Defense Department Senior Advisory Group on Homeland Defense; co-director of the Columbia University Summer Workshop on the Analysis of Military Operations and Strategy (SWAMOS); and holds an appointment as Adjunct Associate Professor at Columbia University’s School of International and Public Affairs.

Dr. Biddle’s book, Military Power: Explaining Victory and Defeat in Modern Battle (Princeton University Press, 2004) won the Council on Foreign Relations Arthur Ross Book Award Silver Medal for 2005, the Harvard University Huntington Prize for 2005, the Institute for Operations Research and Management Science’s 2005 Koopman Prize, and the Army War College Foundation’s 2005 Madigan Award. His other publications include articles in Foreign Affairs, International Security, Survival, Journal of Politics, Journal of Conflict Resolution, Security Studies, Journal of Strategic Studies, Contemporary Security Policy, Defense Analysis, and Military Operations Research; shorter pieces on military topics in the Wall Street Journal, Orbis, Joint Force Quarterly, and Defense News; various chapters in edited volumes; and 28 IDA, SSI, and NATO reports. His research has won Barchi, Rist, and Impact Prizes from the Military Operations Research Society, and he was awarded the Army Superior Civilian Service Medal in 2003.

Dr. Biddle holds AB (1981), MPP (1985), and PhD (Public Policy, 1992) degrees, all from Harvard University.