During 38 years of diplomatic career since 1980, Amb. Choi Sung-joo held such domestic posts as Director for Disarmament and Non-Proliferation, Senior Coordinator for Int’l Organization, Ambassador for International Security, and Ambassador for Performance Evaluation. As for his Ambassadorial posts, he served as Ambassador to Algeria and Poland respectively. In addition, he worked as a member of the UN Secretary General’s Advisory Board on Disarmament Matters(ABDM) and the Head of the Preparatory Secretariat for the Seoul Cyberspace Conference. Since 2019, he has been working at the ‘Ban Ki-moon Foundation for a Better Future’ as Head of International Cooperation and is lecturing at the Korea University. He graduated from Seoul National University and the University of Paris XI.