| 1977 | Deputy Director, Ministry of Finance (MOF) |
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| 1988 | Director, Policy Advisory Group to the Minister (MOF) |
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| 1989 | Assistant Secretary to the President for the Finance and Economy |
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| 1991~1994 | Director, Economic Cooperation Division/ International Organization Division/Overseas Investment Division, MOF |
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| 1994~1996 | Director, Budget Policy Division, Education & Culture Budget Division, SOC Budget Division, Ministry of Finance & Economy (MOFE) |
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| 1997 | Competitiveness Enhancement Committee, Office of the President |
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| 1998 | Chief Secretary to the Deputy Minister, MOFEDeputy Director-General, International Finance Bureau |
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| 1998~2001 | Economic Counselor, Korean Embassy in the UK |
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| 2001 | Economic Secretary to the President for the Industry & Communications |
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| 2002~2003 | Director-General, International Finance Bureau, MOFE |
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| 2004 | Secretary for Economic Policies, Secretary for Coordination and Planning, Office of the President |
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| 2005 | Vice Minister, MOFE |
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| 2006~2008 | Ambassador, The Permanent Mission of the Republic of Korea to the OECD |
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| 2008~2009 | Vice Minister for General Affairs, Prime Minister's Office |
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| Jan. 20, 2009~ | Minister, Prime Minister's Office |
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