Former U.N. Under-Secretary-General for Disarmament Affairs (2003-2006). Commissioner, Japan Atomic Energy Commission (2014-2017), Japanese ambassador to the IAEA and CTBTO (1999-2001), Saudi Arabia (2001-2003) and Switzerland (2006-2008). Japanese Consul-General in Boston, MA, USA. Director-General for Arms Control and Science Affairs, Ministry of Foreign Affairs, Japan (1997-1999), Director, Center for the Promotion of Disarmament and Non-Proliferation, Japan Institute of International Affairs (2008-2014), senior fellow, Belfer Center for Science and International Affairs, Harvard Kennedy School (2018-2019). Also served as a member of the Advisory Board to the International Commission on Nuclear Non-proliferation and Disarmament (2008-2009). Currently, serves inter alia as a member of the Asia Pacific Leadership Network for Nuclear Non-proliferation and Disarmament (APLN), and as Chairperson of Hiroshima Organization for Global Peace (HOPe).
Born in 1945, studied at the University of Tokyo (1964-1967), Amherst College (1967-1969, B.A.), fellow, Harvard (Weatherhead) Center for International Affairs (WCFIA; 1986-1987), senior fellow, Belfer Center for Science and International Affairs, Harvard Kennedy School (2018-2019), member, International Institute for Strategic Studies (IISS; 1984- ).