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ACA’s journal, Arms Control Today, remains the best in the market. Well focused. Solidly researched. Prudent.

– Hans Blix,
former IAEA Director-General

Greg Thielmann

Greg Thielmann

Greg Thielmann has served more than three decades in the executive and legislative branches of government, specializing in political-military and intelligence issues. Before joining ACA in 2009, he worked for four years as a senior professional staffer of the Senate Select Committee on Intelligence (SSCI). He 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. His foreign posts include Deputy Political Counselor of the U.S. Embassy in Brasilia, Brazil; Political-Military Affairs Officer in Moscow, USSR; and Political-Military Affairs Officer in Bonn, Germany. Thielmann also served as Deputy Director of the State Department’s Office of German, Austrian and Swiss Affairs; Special Assistant to Ambassador Paul Nitze (then Special Adviser to the President and Secretary of State on Arms Control Matters); and State Department advisor to the U.S. Delegation at the Geneva INF arms control negotiations. Greg is a member of the Council on Foreign Relations and a former member of the Board of Directors of the Arms Control Association (2003-2005). His July 2003 appearance at an ACA press briefing on faulty intelligence assessments on Iraq’s WMD capabilities led to a CBS News 60 Minutes II segment “The Man Who Knew,” which won an Emmy Award for reporter Scott Pelley.

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Greg Thielmann's primary research areas include:


Recent Publications

  • December 3, 2012

    As the 112th Congress enters its final days, one of its critical priorities should be approving implementing legislation for two treaties that help raise the barriers against nuclear terrorism.

  • September 24, 2012

    Remarks as delivered by Greg Thielmann, Senior Fellow, Arms Control Association at the Gerald R. Ford School of Public Policy at the University of Michigan in Ann Arbor, Michigan on September 20, 2012.

  • August 23, 2012

    Prepared remarks by ACA Senior Fellow Greg Thielmann at Brookings on August 13-14, 2012 on "Defining the Ideal Relationship between our Countries and Looking to Areas of Misunderstanding and Disagreement," at a U.S.-Brazillian workshop in Brasilia, Brazil

  • July 25, 2012

    A long submerged flaw in the nuclear Non-Proliferation Treaty (NPT) surfaced conspicuously in June when Iran announced it intended to build a nuclear-powered submarine. The treaty does not ban a non-nuclear weapons state's production of weapons-grade uranium if it is to be used to power a naval reactor.

  • June 28, 2012

    On June 19, Iran concluded the third round of talks on its nuclear program in as many months, this time in Moscow, with senior officials of the six powers - the United States, the United Kingdom, France, Germany, Russia, and China. Although there were strong incentives for the six to secure limits on Iran's most worrisome stockpiles of enriched uranium and for Iran to avoid an impending tightening of economic sanction, no breakthrough was achieved by the end of the latest round. But neither did diplomatic dialogue come to an end.

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