Academic Appointments
2001∼present, Professor, School of Economics, The University of Seoul,
Jan./2010∼present, Editorial Board Member, Telecommunications Policy
Dec./2004-2006, Editorial Board Member, Korean Review of Applied Economics
Mar./2002∼2006. Editorial Board Member, Korean Telecommunications Policy Review.
Mar./2001-2006, Editorial Board Member, Korean Journal of Industrial Organization.

Professional Appointments
Mar./2013∼Mar./2015, A member of the Policy and Management Evaluation Committee for Ministry of Science, ICT and Future Planning.
Mar./2012∼Mar./2015, Outside director, Hyundai Steel.
Mar./2011∼Feb./2012, President, Korea Academic Society of Industrial Organization
Dec./2010∼Nov./2012, Auditor, Korea Association for Telecommunications Policies
Jul./2010∼Jun./2012, A member of the Policy and Management Evaluation Committee for Korean Communications Committee
Mar./2006∼Feb./2013, Team leader, Brain Korea 21 Research Project (Digital Convergence and Cities: Applied Microeconomics Human Resource Development Team)
Aug./2007∼Aug./2009, A member of the Public Tariff Advisory Committee (Ministry of Strategy and Finance)
Mar./2006∼Feb./2007, Secretary, Korea Academic Society of Industrial Organization
Mar./2005∼Mar./2009, Outside director, KT Hitel Corp.
Oct./2004∼Oct./2005, A member of the Advisory Committee for Competition Policy in IT Industries.
Mar./2001∼Dec./2010, Managing director, Korea Association for Telecommunications Policies
2004∼2006, Organizing committee member, International Telecommunication Society 16th Biennial Conference (Beijing/China).
2003∼2004, Organizing committee member, International Telecommunication Society 15th Biennial Conference (Berlin/Germany).
2000∼2002, Program Coordinator, International Telecommunication Society 14th Biennial Conference (Seoul/Korea).