Visiting Scholar, Lawrence Berkeley National Laboratory, University of California,Berkeley, 2005 - presentAssistant Professor, Andong National University, 2002 - presentSenior Research Fellow, Korea Energy Economics Institute, 1996 - 2002Advisory Committee of Korean Delegates for WTO Service Negotiation,2001-2002Lecturer, Dankook University, 2001The Korean Delegates of OECD Regulatory Reform in Electricity Industry, 1999nLecturer, Sookmyung Women's University, 1997 - 1999Teaching Assistant for Principles of Economics, Cornell University,1991-1995Vice President of Korean Graduate Students Association at Cornell University 1992- 1993