A. Gregory Thielmann is a former mid-level official in the U.S. State Department's Bureau of Intelligence and Research who, after retiring in September 2002, publicly disputed the rationale for the U.S. invasion of Iraq offered by the George W. Bush administration. He is currently a board member of the Arms Control Association and member of the Council on Foreign Relations. His areas of expertise and research include threat assessments, nuclear/missile proliferation, and US-Russian strategic arms control.