· 2010.2-6 Acting President of KIAS · 2009.2 – Vice President of KIAS · 2007.8-2008.11 Chair of School of Computational Sciences, Korea Institute for Advanced Study · 2005-2006 Chair of School of Computational Sciences, Korea Institute for Advanced Study · 2002.12.- Professor of Computational Sciences, Korea Institute for Advanced Study · 2002 KIAS Assistant Professor, Korea Institute for Advanced Study · 2000-2002 Research Associate Professor of Physics, KAIST · 1994-2002 Principal Researcher, Computational Science and Engineering Lab, SAIT. · 1993-1994 Postdoctoral Research Associate, Texas Center for Superconductivity · 1993.6 Department of Physics, University of Houston (Ph.D) · 1985.2 Department of Physics, Seoul National University (B.S.)