Ambassador-at large Republic of China (Taiwan) (2017- )
Chair Professor, Global Health Security, College of Public Health, Taipei Medical University (2016-2017- )
Director-General, Centers for Disease Control, Ministry of Health and Welfare (2014-2016)
Advisor, Taiwan Embassy in Washington DC Taipei Economic and Cultural Representative Office (TECRO) (2010-2014)
Director, Centers for Disease Control, Department of Health, Taiwan (2004-2010)
Chief Coordination Officer and Spokesman of the Taiwan SARS Task Force (2003)
Health advisor, Taiwan Embassy in Washington DC Taipei Economic and Cultural Representative Office (TECRO) (2002-2004)
Director, Bureau of Health Planning, Department of Health, ROC (Taiwan) (2001-2002)
Assoc. Professor and Director, Institute of Health Information and Decision Making, National Yang-Ming University, Taipei, Taiwan (2000-2001)
Secretary General, National Yang-Ming University, Taipei, Taiwan (1996-1998)
Assoc. Professor of Epidemiology and Medicine; Assoc. Dean, School of Medicine, National Yang-Ming University, Taipei, Taiwan (1991-2000)
Director, Department of Social Medicine, National Yang-Ming University, Taipei, Taiwan (1991-1994)
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