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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 <http://www.armscontrol.org/events/iraq_july03> led to a CBS News 60 Minutes II segment <http://www.cbsnews.com/stories/2003/10/14/60II/main577975.shtml> titled “The Man Who Knew,” which won an Emmy Award for reporter Scott Pelley.


Greg Thielmann's primary research areas include:

Read more by Greg Thielmann:

  • Threat Assessment Brief
    May 7, 2014

    The international community has been acutely concerned for many years about Iran's increasing capacity to produce material for nuclear weapons. With sufficient fissile material and a warhead design, Iran could use its existing ballistic missiles to pose a credible nuclear threat throughout the region. Consequently, after repeatedly directing Iran to suspend uranium enrichment, the UN Security Council decided in 2010 that Iran also had to halt all activities related to ballistic missiles capable of delivering nuclear weapons.

  • Issue Briefs
    March 20, 2014

    As President Vladimir Putin exploits the results of Crimea's illegitimate referendum and as Russian troops gather on Ukraine's eastern border, alarms have been raised in the West that U.S.-Russian relations are on the verge of plummeting to Cold War levels.

  • Issue Briefs
    January 13, 2014

    In nuclear negotiations, as in medicine, the first principle is: "Do no harm." Yet a bill authored by Sen. Robert Menendez (D-NJ) and co-sponsored by 58 of his colleagues, threatens to pull the plug on the patient just as the Iran nuclear negotiations are entering their most delicate phase.

  • Arms Control Today
    December 4, 2013

    Command and Control: Nuclear Weapons, the Damascus Accident, and the Illusion of Safety
    Eric Schlosser, Penguin Press, 2013, 632 pp.

    Technology Transfers and Non-Proliferation: Between Control and Cooperation
    Oliver Meier, ed., Routledge Global Security Studies, 2013, 280 pp.

  • Threat Assessment Brief
    September 20, 2013

    As negotiations are poised to resume between Iran and the six powers seeking to rein in Iran's nuclear program, it is difficult to avoid a sense of déjà vu.

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ACA In The News

Syria May Have Hidden Chemical Arms, U.S. Says
The New York Times
September 4, 2014

Reports propose compromise for Iran nuclear deal
Al-Monitor
August 27, 2014

A Farewell to Arms
MIT Technology Revie
August 19, 2014

Updated: Firing of Los Alamos political scientist spurs criticism
Science AAAS
August 15, 2014

Sorry, Skeptics: The Iran Nuclear Deal is Working
The National Interest
August 7, 2014

North Korea Scales Up Yongbyon Nuclear Site's Activities- Report
Eurasia Review
August 7, 2014