Clay mineralogy, its related mineral chemistry,
crystallography, transformation and their behavior in the
surface horizon and soil system.

1974~1986 Senior Researcher, Korea Institute of Energy
and Resources
1980 Visiting Scientist, British Geological
Survey, U.K.
1986~ Professor, Dept. of Earth System Sciences,
Yonsei University
1995~1996 Vice-President, Mineralogical Society of Korea
1997~1998 Visiting Scientist, Oak Ridge National
Laboratory
1999-2000 Editor-in-Chief, Journal of the Mineralogical
Society of Korea
2000-2002 President, Korea Society of Economic and
Environmental Geology
2000~ Director, Research Institute of Groundwater
and Soil
Environments, Yonsei University
2002~2003 Dean of Faculty, Yonsei University
2002~2003 President, The Mineralogical Society of Korea

1990 Academic Award, The Korean Institute of
Mining Geology
1991 Outstanding Paper Award, Korean Federation
of Science and
Technology
1994 Mogryun Medal of Civil Merit
1996 Distinguished Achievement Award, Yonsei
University
2004 Kim Ok-Joon award, Korea Soc. Econ. &
Environ. Geol.