| Feb 1971 | Passed the 10th Civil Service Examination |
|---|---|
| Dec 1989 | Public information Officer of Ministry of Transportation |
| May 1992 | Director General of Aviation at Ministry of Transportation |
| Sep 1993 | Director General of Tourism at Ministry of Transportation |
| Apr 1995 | Director General of Territory Planning at Ministry of Construction and Transportation |
| Mar 1996 | Assistant Minister of Planning & Management at Ministry of Construction and Transportation |
| Dec 1997 | Assistant minister of Transport Policy at Ministry of Construction and Transportation |
| Mar 1998 | Chairman of National Railroad Administration |
| Oct 2001 | Director of Chungnam Development Institute |
| Apr 2002 | President of Jeju Free International City Development Center |
| Apr 2003 | CEO of Korea High Speed Rail Construction Authority |
| Jan 2004 | Chairman and CEO of Korea Rail Network Authority |
| Mar 2007 | Chair Professor of Department of Railroad Civil and Environmental Engineering at Woosong University |
| Feb 2008 ~ | Minister of Land, Transport and Maritime Affairs |