Second Secretary, Korean Embassy in Paris

Deputy Director, Western European Division, Foreign Ministry, Seoul

Counsellor, Korean Embassy in Bangkok

Director for International Economic Organizations, Foreign Ministry,

Director for International Environmental Organizations, Foreign Ministry,

Counsellor, Korean Mission to the United Nations, New York

Deputy Director-General, Office of Government Policy Co-ordination, Prime Minister’s Office, Seoul

Counsellor, Korean Embassy in London

Minister-Counsellor at the Office of the President of the United Nations General Assembly (worked with H.E.Mr. Ban Ki-Moon, UNSG, who was chef de cabinet of President of UNGA)

Director-General, Policy Planning Bureau, Ministry of Foreign Affairs and Trade

Ambassador of the Republic of Korea to the Republic of Uzbekistan

Professor cum Ambassador at the Graduate School of International Studies, Yonsei University

Ambassador for Climate Change, Ministry of Foreign Affairs and Trade

Ambassador for Energy and Resources, Ministry of Foreign Affairs and Trade

Ambassador, Advisor for International Relations of the Jeju Special Self-Governing Province (at the protocol level of Deputy-Minister)

Deputy Minister and Ambassador for Overseas Koreans, Consular Affairs and Counter-terrorism, Ministry of Foreign Affairs and Trade

Chairman of the Working Group three of the Contact Group on Piracy off the Coast of Somalia (CGPCS) under the auspices of the United Nations

Ambassador of the Republic of Korea to the Czech Republic

Ambassador at Large of the Korean Foreign Minister

Senior Advisor for Foreign Relations at Korean lawfirm “Sanwoo”

Vice Chairman of the Czech-Korea Forum for the Future

Director, Center for Global Nuclear Business (CGNB) at KINGS (KEPCO International Nuclear Graduate School)