• Independent (2012-Present)
• Chairman of the Strategy CHA, CHA Health Systems (2012 ~ present)
• Professor Emeritus, Yonsei University (2012 ~ present)
• Chairman of the Confederation of Sports, Korea University (two thousand and ten ~ 2,012th)
• Trustee. Council Korea (two thousand and eight ~ two thousand and twelve)
• President Yonsei University (the 2,008th ~ 2,012th)
• Chairman of the Executive Board. Preventive Medicine Association of Korea (2 006 ~ 2008)
• Professor, Department of Preventive Medicine and Public Health (1982 ~ 2012).
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