1August 1999-July 2006, Assistant Professor, Department of East Asian Studies, Princeton University.
From August 2006 to July 2007, he was a visiting professor in the Department of East Asian Language and Civilization Studies at Harvard University.
August to 20, 200711,Assistant Professor, Department of History, University of Kansas.
20 1 1 From June to present, he is a researcher at the Department of Peking University History and the China Ancient History Research Center.