Yasuyoshi Komizo served as Ambassador, Permanent Mission of Japan to the International Organizations in Vienna (2008-2010), and Ambassador of Japan to the State of Kuwait (2010-2012). After retirement from the foreign service, he served as Chairperson of Hiroshima Peace Culture Foundation (2013-2019). Earlier, he also served as Special Assistant to Director General of the International Atomic Energy Agency (1997-2002)