Retired in 2018 from a career in the U.S. Department of State and the Defense Department, where he was primarily responsible for nuclear weapons policy and nonproliferation issues. During his career, he negotiated nuclear arms control agreements with Russia, Belarus, Kazakhstan, and Ukraine, he participated in several inspections of Russian nuclear weapon facilities, and was the State Department’s representative to the ABM Treaty commission when the U.S. withdrew from that treaty. Dr. Kartchner led the team that drafted the 2004 joint Secretary of State and Secretary of Defense statement on the need for strategic nuclear modernization. He was the State Department representative to the 2009 congressionally charted Strategic Posture Review Commission, chaired by former Secretaries of Defense William J. Perry and James R. Schlesinger. As senior foreign policy advisor at the Defense Threat Reduction Agency, he organized and participated in nuclear dialogues with numerous countries. He is the co-editor and contributor to several books on U.S. national security. His co-edited 2014 book, On Limited Nuclear War in the 21st Century is widely read today in the strategic nuclear community, and has been translated into Korean for use in the South Korean senior officer’s education program. His MA and PhD in international relations are from the University of Southern California, and his BA is from Brigham Young University.