1986, Ph.D. (Seismology), Faculty of Science, Uppsala University.
Thesis title: "Determination of earthquake source properties and their
implication in regional tectonics".
1980, Diploma di Perfezionamento in Fisica (Geophysics), Advanced School of
Physics, ICTP and Institute of Geodesy and Geophysics, University of
Trieste, Italy. Graduated with honor.
1977, M. S. in Geology with Geophysics major, Yonsei University.
1973, B. S. (Geology), Yonsei University, Seoul, Korea.
1997 - present,  Research Scientist, Lamont-Doherty Earth Observatory of Columbia University.
1989 - 1997,  Associate Research Scientist, Lamont-Doherty Earth
Observatory of Columbia University.
1988 - 1989,  Post-Doctoral Fellow in Geology, Department of Earth and Planetary
Sciences, Harvard University.
1986 - 1988,  Researcher, Seismological Department, Uppsala University.