Sep 2008-present: Professor, School of Mathematical Sciences, Peking University
Sep 2003-Aug 2008: Associate Professor, School of Mathematical Sciences, Peking University
Jan 2007-Jun 2007: Visiting Professor, Hong Kong Baptist University
Feb 2005-Jan 2006: Visiting Research Scholar, California Institute of Technology, USA
Feb 2003-Aug 2003: Assistant Professor, School of Mathematical Sciences, Peking University
Feb 2002-Jan 2003: Post-doctoral Research Assistant, CBS, University of Kent at Can- terbury, UK