Ambassador Jonathan Dean "works on issues related to national and European security, arms control, and international peacekeeping. He joined UCS in 1984, after serving as the US representative and deputy representative to the NATO-Warsaw Pact force reduction negotiations in Vienna between 1973 and 1981.
"Dean began his Foreign Service work in 1950 in Bonn as liaison officer between the US High Commission and the Federal German government. Later he served as desk officer for East Germany in the Department of State and as first secretary at the American Embassy in Prague. In the early 1960s, he was principal officer in Elisabethville, Katanga, during the Tshombe secession and the subsequent UN peacekeeping intervention, and deputy director of the Office of United Nations Political Affairs, Department of State, where he worked on peacekeeping and economic sanctions. In 1968 he returned to the American embassy in Bonn as deputy US negotiator for the 1971 quadripartite agreement on Berlin.
"Dean's views have been published in the New York Times, Los Angeles Times, Boston Globe, Christian Science Monitor, Washington Post and Baltimore Sun, as well as in journals such as Foreign Policy, International Security and Foreign Affairs. He is the author of three books, including Ending Europe's Wars, an evaluation of the post-cold war security situation in Europe and Russia. A graduate of the National War College, Dean holds a PhD in political science from George Washington University. During World War II, he saw combat infantry service from Normandy to the Elbe." 
"In 1982, Ambassador Dean joined the Carnegie Endowment for International Peace as resident associate for arms control and European security issues. Since 1984, he has been adviser on arms control and international security issues to the Union of Concerned Scientists.
"He is the author of several books on European security, including Ending Europe's Wars (Twentieth Century Fund Press, 1994) on how the cold war ended, post cold war security problems, and the institutions established to deal with them.
- President, Institute for Defense and Disarmament Studies
- Research Advisory Board, Project on Defense Alternatives
- Advisory Board, Global Security Institute
- Council Member, British American Security Information Council
- Director, NGO Committee on Disarmament, Peace and Security
- Steering Committee Member, Global Action to Prevent War
- National Advisory Board, Council for a Livable World