He is Director of Research Center for Nuclear Weapons Abolition, Nagasaki University (RECNA), Japan. He is also Editor-in-Chief of Journal for Peace and Nuclear Disarmament (J-PAND) published by Taylor & Francis. He is a member of Nagasaki Peace Declaration Drafting Committee of Nagasaki city, Japan. He was Deputy Director of the Editorial Board of the Asahi Shimbun and an editorial writer for the Asahi Shimbun with a special interest in nuclear weapons issues, Tokyo, Japan. He served as a member of the Advisory Panel of Experts on Nuclear Disarmament and Non-Proliferation for Japan’s Minister of Foreign Affairs, Tokyo. He was Visiting Scholar of Carnegie Endowment for International Peace (CEIP) in Washington D.C. and is now Non-resident Scholar. He is a member of International Panel on Fissile Materials (IPFM) which is supported by Princeton University's Program on Science and Global Security. He has a PhD in International Public Policy from Osaka University, Japan and has many publications both in Japanese and English, including “The 2017 Nuclear Ban Treaty A New Path to Nuclear Disarmament” (Routledge, 2020) edited by Joseph A. Camilleri, Michael Hamel-Green, Fumihiko Yoshida.