He is a director of Asian Security Initiative of East Asian Institute. He is also a member of Advisory Committee for Senior Secretary to the President for Foreign Affairs and National Security, and the Ministry of Foreign Affairs and Trade. He is one of the members of Presidential Council of Future and Planning. He received his MA degree from the Seoul National University, and Ph.D degree from Northwestern University in the field of International Relations Theory. Major articles include “Theoretical Approaches to Alliance: Implications on the R.O.K.-U.S. Alliance,” “The Cold War and Its Transition for Koreans: Their Meaning from A Constructivist Viewpoint,” and “Hans Morgenthau on Realist Normative theory, Cold War Structure, and some implications on inter-Korean Relations”