• 2012-2016: Legislator, Legislative Yuan, Republic of China (Taiwan)
• 2007-2008: Secretary General, National Security Council, Republic of China (Taiwan)
• 2006-2007: Secretary General, Office of the President, Republic of China (Taiwan)
• 2004-2006: Minister, Ministry of Foreign Affairs, Republic of China (Taiwan)
• 2001-2004: Legislator, Legislative Yuan, Republic of China (Taiwan)
• 1993-2001: Magistrate, Tainan County, Republic of China (Taiwan)
• 1992: Legislator, Legislative Yuan, Republic of China (Taiwan)
• 1973-1992: Officer, Department of Commerce, U.S. Federal Government, USA
• 1982: Chairman, Formosan Association for Public Affairs (FAPA), USA
• 1979: Chairman, World Federation of Taiwanese Associations, USA
• 1979: Chairman, Taiwanese Association of America, USA