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- 20140914 – 20140930; 20150201-20150214 Visiting Scholar , Max Planck Institute Mathematics, Bonn, Germany
- 20141001- 20141130 ; Visiting Professor,Columbia University, Dept of Mathematics, USA
- 20110326 – 20110625 Visiting Professor, Stanford University, Dept of Mathematics, USA
- 20110210 – 20110325; Visiting Scholar, Max Planck Institute, Mathematics, Bonn, Germany
- 20100124-20100207; Visiting Scholar, Institute for Advanced Study, Princeton, Analytic Number Theory Special Year
- 200505; Visiting Professor, Fourier Institute, Grenoble, France
- 200505; Visiting Professor, University of Heidelberg, May 2005
- 2005, Spring: Stanford University,Visiting Professor
- 1996. 03- 1997.02: University of Cambridge, England, Visiting Scholar
- 1990.01-present: Pohang Unviersity of Science and Technology(POSTECH), Professor
- 1989. 09 – 1990.01: University of Colorado, Assistant Professor
- 1988.09 – 1990.01: Univ.of Maryland(Math), Visiting Assistant Professor
- 1986.08 – 1988.08: Ohio State Univ.(Math), Lecturer
- 1986 Temple University (Ph.D Number Theory (Modular form))
- 1982 Ewha Womans University (B.S. Math)
