Director of Research Center for Global Risk, Nagasaki University. Research on nuclear abolition, nuclear arms control, disarmament and non-proliferation, nuclear risk reduction from diplomatic and international security perspectives. Former Japanese diplomat and a Special Advisor for Arms Control, Disarmament and Non-Proliferation at the Ministry of Foreign Affairs of Japan. M.A. in International Policy Studies with a certificate on Non-proliferation Studies from Middlebury Institute of International Studies at Monterey, and Ph.D. in Laws from Hitotsubashi University. Concurrent professor at Research Center for Nuclear Abolition (RECNA).