Greg Thielmann was previously a U.S. Foreign Service Officer for 25 years, last serving as Director of the Strategic, Proliferation and Military Affairs Office in the Department of State's Bureau of Intelligence and Research. He has served more than three decades in the executive and legislative branches of the U.S. government, specializing in political-military and intelligence issues. Before joining the Arms Control Association as a senior fellow in 2009, he worked for four years as a senior professional staffer of the Senate Select Committee on Intelligence (SSCI). His foreign posts included the U.S. Embassies in Brasilia, Brazil; Moscow, USSR; and Bonn, Germany, and the U.S. Mission in Geneva, Switzerland on the U.S. Delegation to the INF arms control negotiations. Thielmann also served as Deputy Director of the State Department's Office of German, Austrian and Swiss Affairs and as Special Assistant to Ambassador Paul Nitze (then Special Adviser to the President and Secretary of State on Arms Control Matters). He is currently a member of the trilateral (German–Russian–U.S.) Deep Cuts Commission.