| 2016 - Present |
Senior Advisor, Lee & Ko |
| 2020.7 - 2021.7 |
Ambassador for Economy and Trade |
| 2019.9 - 2020.8 |
Adjunct Professor, GSIS, Yonsei University |
| 2017 - Present |
Member of Committee of Diplomatic Capacity Assessment, Korea National Diplomatic Academy |
| 2016 - 2020.4 |
Outside Director, Lotte Shopping |
| 2016 - 2018 |
Visiting Professor, GSIS, SNU |
| 2016 - 2018 |
Trade Policy Commissioner, ASPI |
| 2015 - 2018 |
Member, Advisory group , UNCERF |
| 2013 - 2018 |
Chairman, WG on Accession of Uzbekistan to WTO |
| 2014 - 2015 |
Chairman, CTS of the WTO |
| 2013 - 2014 |
Chairman , Executive Committee, UNHCR |
| 2013 -2014 |
Vice-Chairman, UNCC |
| 2012 - 2015 |
Ambassador in Geneva |
| 2010 - 2012 |
Deputy Minister for FTA, MOFAT |
| 2009 - 2010 |
Ambassador for DDA, MOFAT |
| 2006 -2009 |
Economic Minister, Korean Embassy in the U.S. |
| 2005 |
Executive Director, APEC |
| 2004 |
Deputy Executive Director, APEC |
| 2002 - 2003 |
Deputy Director General, APEC |
| 2001-2002 |
Adviser to the President of UNGA |
| 1999 - 2002 |
Counselor, Korea's Mission to the UN in NY |
| 1997 -1999 |
Director, Division of Environmental Cooperation, MOFA |
| 1994 -1997 |
Counselor, Korea's Mission to the UN in Geneva |
| 1988 -1991 |
First Secretary, Korean Embassy in Kenya |