| 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 |