The assistant secretary of state for international security and nonproliferation is the head of the Bureau of International Security and Nonproliferation, which is responsible for managing the nonproliferation, counter-proliferation functions of the United States Department of State. The position was created on September 13, 2005, when the Bureau of Arms Control and the Bureau of Nonproliferation were merged. The Assistant Secretary of State for International Security and Nonproliferation reports to the Under Secretary of State for Arms Control and International Security Affairs.
Stephen Rademaker was the first Acting Assistant Secretary of State for International Security and Nonproliferation. He had been the Assistant Secretary for the Bureau of Arms Control, and in February 2005 he was named the head of the Bureau for Nonproliferation pending the two bureaus' merger.
Assistant Secretaries of State for International Security and Nonproliferation #NameAssumed officeLeft officePresident(s) served under -Stephen G. Rademaker (acting)September 13, 2005May 20, 2006 George W. Bush -Francis C. Record (acting)May 21, 2006October 1, 20061John RoodOctober 2, 2006September 27, 2007 -Patricia A. McNerney (acting)September 28, 2007January 20, 2009 -C.S. Eliot Kang (acting)January 20, 2009June 15, 2009George W. BushBarack Obama -Vann Van Diepen (acting)June 15, 2009September 26, 2011Barack Obama2Thomas M. CountrymanSeptember 27, 2011January 27, 2017Barack ObamaDonald Trump -C.S. Eliot Kang (acting)January 27, 2017January 8, 2018 Donald Trump3Christopher Ashley FordJanuary 9, 2018January 8, 2021 -C.S. Eliot Kang (acting)January 8, 2021March 31, 2022Donald TrumpJoe Biden4C.S. Eliot KangMarch 31, 2022January 20, 2025Joe Biden -Ann K. Ganzer (acting)January 20, 2025March 7, 2025 Donald Trump -Paul Watzlavick (Senior Bureau Official) March 7, 2025December 30, 20255Christopher YeawDecember 30, 2025Present
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