1989.8–1994.6 Resident Physician, The First Hospital of Peking University
1994.6–1999.8 Attending Physician, The First Hospital of Peking University
1999.9–2009.8 Associate Chief Physician, The First Hospital of Peking University
2009.9–2014.4 Chief Physician, The First Hospital of Peking University
2001–2014.4 Director of Emergency Department, The First Hospital of Peking University
Since May 2014 Successively served as Chief Physician, Director of the Department of Emergency and Critical Care, Deputy Secretary of the Party Committee, Secretary of the Discipline Inspection Commission, and Vice President of Beijing Tsinghua Changgung Hospital
2015.12–2020.12 Associate Professor, Tsinghua University Medical Center, Beijing Tsinghua Changgung Hospital
Since December 2020 Professor, Tsinghua University Medical Center, Beijing Tsinghua Changgung Hospital
2000.1–2000.8 Department Assistant, Department of Emergency Medicine, Queen's University, Canada
2000.8–2000.12 Visiting Scholar, Mount Sinai Emergency Center, Los Angeles, USA