| 2011.4 - present | Assistant Professor, National Graduate Institute for Policy Studies, Tokyo, Japan |
| 2011.6-2011.9
| Visiting Scholar, Center for International Cooperation and Strategy, Hankuk University of Foreign Studies, Seoul, South Korea |
| 2007.2-2011.3 | Economist, Economic Research Institute, the Bank of Korea, Seoul, South Korea |
| 2006.9-2007.2 | Researcher, Institute of Social Science, Sogang University, Seoul, South Korea |
| 2006.9-2007.2 | Occasional Lecturer, Graduate School of International Studies, Sogang University, Seoul, South Korea |
| 2006.9-2007.2 | Visiting Research Fellow, Institute for Far Eastern Studies, Kyungnam University, Seoul, South Korea |
| 2004.4-2005.12 | Visiting Scholar, Institute of International Relations, National Chengchi University, Taipei, Taiwan |
| 2003.5-2004.3 | Japan Foundation Fellow, Tokyo, Japan |
| 2003.4-2004.4 | Visiting Research Scholar, Institute of Social Science, the University of Tokyo, Tokyo, Japan |
| 2000.11-2001.8 | Researcher, Korea Institute of Finance, Seoul, South Korea |