Bachelor degree: Seoul National University, Korea, 1977-1981, Nuclear Engineering

Master degree: Seoul National University, Korea, 1981-1983, Nuclear Engineering

                    Harvard University, Cambridge, MA, 1990-1991, Environmental Health Science

Doctoral degree: University of Cincinnati, Cincinnati, OH, 1983-1987, Nuclear Engineering

                      Harvard University, Cambridge, MA, 1991-1994, Environmental Health Science