

| - Mar. 2013 | Minister of Foreign Affairs |
| - Jan. 2013 | Member of the Subcommittee on Foreign Affairs, National Defense and Unification, the 18th Presidential Transition Committee |
| - Mar. 2009 | Visiting Professor, Graduate School of International Studies (GSIS), Sogang University, Seoul, Korea |
| - Jan. 2009 | Senior Advisor, Law Offices of Kim & Chang |
| - Dec. 2006 | Senior Presidential Secretary for Foreign, Security and Unification Policy |
| - Jan. 2006 | Deputy Minister for Foreign Affairs, MOFAT |
| - Sep. 2004 | Senior Coordinator, National Security Council |
| - Jul. 2002 | Minister, Korean Embassy in the United States of America |
| - Feb. 2000 | Minister, Korean Permanent Mission to the UN Secretariat and International Organizations in Geneva, Switzerland |
| - Jul. 1999 | Deputy Director-General, North American Affairs Bureau, MOFAT |
| - Feb. 1999 | Deputy Director-General, Asian and Pacific Affairs Bureau, Ministry of Foreign Affairs and Trade (MOFAT) |
| - Jan. 1995 | Minister-Counsellor, Korean Embassy in the Republic of Singapore |
| - Jan. 1994 | Director, North America Division I, MOFA |
| - Jan. 1990 | Counsellor, Korean Permanent Mission to the United Nations in New York, United States of America |
| - Jul. 1984 | Consul, Korean Consulate General in Sydney, Australia |
| - Mar. 1977 | Joined the Ministry of Foreign Affairs (MOFA) |
| - Nov. 1976 | Passed High Diplomatic Service Examination |