- 2019/03 - 2019/08 Seoul National University Visiting Scholar: Institute of Economic Research
- 2018/09 - 2019/02 University of Cambridge Academic visitor
- 2011/04 - 立命館大学 Professor
- 2009/09 - 2010/09 Visiting Scholar : Wethearhead East Asian Institute, Columbia University, New York.
- 2002/09 - Associate Professor : College of Economics, Ritsumeikan University, Japan. Macroeconomics, Development Economics, International Finance
- 2002/09 - Associate Professor : College of Economics, Ritsumeikan University, Japan.
- 2002/02 - 2002/05 Research Assistant : University of Massachusetts. Amherst, MA. U.S.A. (Field of Research : The change of the Korean economic model in the 1990s, with professor Crotty, J.)
- 2001/11 - 2002/05 Research Assistant:A comparative study of venture capitalists' investment in the U.S. and Korea with professor Zacharakis in Babson College and professor Bahn in National Jinju Industrial University
- 2000/09 - 2002/05 Teaching Assistant : University of Massachusetts, Amherst, U.S.A. Macroeconomics, International Economics.
- 2000/09 - 2001/05 Research Assistant : University of Massachusetts. (Field of Research : The contradiction of neoliberal globalization and analysis on neoliberal restructuring)
- 1999/03 - 1999/06 Lecturer : Seoul National University, Graduate school of Medical Study, Economics,
- 1998/04 - 1998/12 Research Intern, WIDER (World Institute of Development Economics Research), UN university, Finland. (Field of Research : The change of the Korean financial system and the financial crisis)
- 1998/03 - 1998/05 Lecturer : Kookmin University, Economics.
- 1998/01 - 1998/02 Lecturer : Korea Open University, International Economics.
- 1997/09 - 1997/12 Lecturer : Sangmyoung University, Economic Development and Political Economy.
- 1996/09 - 1996/12 Lecturer : Seoul City University. Economic Development.
- 1995/03 - 1996/02 Research Assistant : Seoul National University,