1987.09.-1999.08. Assistant, Researcher, Senior researcher, IFES, Kyungnam University
1999.09.-2000.01. Lecturer, IFES, Kyungnam University
2000.01.-2001.03. Senior Deputy Director, Ministry of Unification
2000.06. entourage, Inter-Korean Summit
2000.07.-2000.12. Assistant Chief Delegate, Inter-Korean Ministerial Talks
2001.04.-2003.02. Full-time lecturer, IFES, Kyungnam University
2003.03.-2006.02. Assistant professor, Full time lecturer, University of North Korean Studies
2004.04.-2012.02. Directir, IFES Office of International Affairs, Kyungnam University
2006.03.-2014.02. Associate professor, Assistant professor, University of North Korean Studies
2008.09.-2012.06. member of the Policy Committee, Heung Sa Dahn
2012.01.-2012.12. Planning Director, The Korean Association of International Studies
2014.01.-2015.03. Director, The Korean Association of North Korean Studies
2017.10.-2019.12. Political consultant, Cheongwadae Presidential Commission on Policy Planning
2007.03.-Present. Director, Yun Peace Foundation
2007.12.-Present. Consultant, Northeast Asian Community Culture Foundation
2012.05.-Present. member of the Policy Committee, Korean Council for Reconciliation and Cooperation
2012.06.-Present. Researcher, Heung Sa Dahn Dosan Unification Reserch
2013.01.-Present. Director, The Korean Association of International Studies
2013.09.-Present. Consultant, Ministry of Unification Policy Advisory Committee
2014.03.-Present. professor, University of North Korean Studies
2015.01.-Present. vice president, The Korean Association of North Korean Studies
2017.03.-Present. Vice President, University of North Korean Studies Public Affairs
2017.09.-Present. Permanent member, National Unification Advisory Council
2018.03.-Present. Expert Advisory, Presidential Inter-Korean Summit Preparatory Committee