Director General of the International Atomic Energy Agency (IAEA), he previously served as Permanent Representative and Ambassador Extraordinary and Plenipotentiary of Japan to the International Organizations in Vienna (2005-2009). He chaired the 2007 Preparatory Committee for the 2010 Nuclear Non-proliferation Treaty Review Conference. Before that, he was appointed as Director-General for the Disarmament, Non-Proliferation and Science Department at the Japanese Foreign Ministry (until 2005) after serving as a governmental expert on the U.N. Expert Group on Disarmament and Non-Proliferation Education in 2001. He graduated from the Tokyo University Faculty of Law.