| 2021-Present |
Lee & Ko |
| 2018-2021 |
Executive Vice Chairman, Korea International Trade Association (KITA) |
| 2016-2018 |
CEO, Korea Trade Network (KTNET) |
| 2015-2016 |
Vice Chairman, Korean Free Economic Zones Committee |
| 2014-2016 |
Chair Professor of Energy Policy, Seoul National University of Science and Technology |
| 2013-2014 |
2nd Vice Minister, Ministry of Trade, Industry and Energy (MOTIE) |
| 2011-2013 |
Deputy Minister for Trade and Investment, Ministry of Knowledge Economy (MKE) |
| 2009-2011 |
Director General for Energy Policy and Trade, Ministry of Knowledge Economy (MKE) |
| 2007-2009 |
Director General for Low Carbon Society, Energy & Environment, Office for Government Policy Coordination Prime Minister's Secretariat (OPM) |
| 2002-2006 |
Director of Foreign Investment Promotion, Gas Industry, Petroleum Industry Division, Ministry of Trade, Industry and Energy (MOTIE) |
| 1999-2002 |
Commercial Attaché, Consulate of the Republic of Korea in New York, U.S.A. |