| 2017-Present | Lee & Ko | 
													
															| 2013-2017 | Distinguished Professor of Social Welfare Studies, Kookmin University Graduate School of Public Administration | 
													
															| 2011-2013 | Vice-Minister, Ministry of Health & Welfare | 
													
															| 2010-2011 | Chief Officer, Office for Healthcare Policy, Ministry of Health & Welfare | 
													
															| 2009-2010 | Chief Officer, Office for Social Welfare Policy, Ministry of Health & Welfare | 
													
															| 2009 | Director, Bureau of Health Policy, Ministry of Health & Welfare | 
													
															| 2016-Present | Advisory Member, the Financial Advisory Committee, the Financial Supervisory Service | 
													
															| 2007-2008 | Bureau of Senior Policy, Headquarters for Low Fertility and Aging Society Policy, Ministry of Health & Welfare | 
													
															| 2005-2007 | Bureau of Policy Coordination, Headquarters for Low Fertility and Aging Society Policy, Ministry of Health & Welfare | 
													
															| 2005 | Director-General of National Pension Bureau, Ministry of Health & Welfare | 
													
															| 2004-2005 | Concurrent Director of Health & Welfare Policy Innovation, Ministry of Health & Welfare | 
													
															| 2002-2004 | Director (Deputy Commissioner) of Division of Welfare Policy, Ministry of Health & Welfare | 
													
															| 1983-2002 | Director of Division of Health Insurance Policy and Division of Senior Welfare, Ministry of Health & Welfare |