Studies on chemical modification of nucleic acids.

1979~1983 Researcher, Korea Research Institute of Chemical Technology
1980~1981 UNESCO Fellow, Tokyo Institute of Technology
1988~1993 Assistant Professor, POSTECH
1993~1999 Associate Professor, POSTECH
1995 Visiting Scholar, University of Tokyo
1996~1997 Visiting Scholar, The Scripps Research Institute
1999~ Professor of Chemistry, POSTECH
2006~2008 Head, Department of Chemistry, POSTECH
2006~2008 Director, BK School of Molecular Science

1999 Jang Sehee Award in Organic Chemistry, Korean Chemical Soc.
2005 Aldrich Award 2005, Korean Chemical Soc.
2008 Scientist of the Month Award, KOSEF