Bachelor in Law with honors, Seoul National University, 1973. Master of Arts in Philosophy, Sogang University, Seoul, 1987. Doctor of Philosophy in Philosophy, Sogang University, Seoul, 1993.
International fin banker Korea Development Bank, Seoul, 1976-1984. Lecturer philosophy Sogang University, 1988-1995. Lecturer medieval philosophy Seoul National University, since 1996.
Elected member National Assembly, 2000—2002, member house steering committee, 2000—2001. Visiting fellow in philosophy Harvard University, Cambridge, Massachusetts, 1991-1992. Postdoctoral researcher in philosophy Oxford (England) University, 1993-1994.
Chief policy maker for Democratic Party president, 1997, chairman in Mapo-gab-gu, 1997. Chairman Grand National Party in Mapo-gab-gu, 1997-1998, Hanam City, 2000-2001, deputy floor leader, 2000-2002. Member Government Administrator Local Automony Committee, 2000-2002.
Member Korean Philosophical Association, Christian Philosophical Association.
Married Mee-Young Song, May 2, 1981. Children: Ji-Hoon, Da-Hyun.