- President (2008-), Standing Director (2005-2006), Director (2005-2008), Deputy Secretary General (1994-1995), Chairman of the Juvenile Issues Research Committee (1994-1995), Chairman of the Criminal Procedure Law Committee (2002-2003, 2005-2008), Taiwan Bar Association
- President (2003-2005), Standing Director (1996-1999,2002-2005), Director (1993-1996), Secretary General (2000-2002), Deputy Director-General (1990-1993), Chairman of the Criminal Law Committee (1996-2002), Vice Chairman of the Editing Committee, Taipei Bar Association Law Journal (1995-1999), Chairman of the Foreign legal Affairs Committee (2002-2003), Chairman of the Constitutional Law Committee (2005-2008), Taipei Bar Association
- Chairman, Taiwan Attorney Disciplinary Review Committee (2009-)
- Member, Taiwan Attorney Disciplinary Committee (2003-2004)
- President (2009-), Standing Director (2003-2005), Director (1992-1993,2002-2003), Supervisor (1994-1995, 2000-2001), Taiwan Law Society
- Director, Taiwan Jurist Association (2003-2006)
- Director (2000-), Member of the Executive Committee (1996-1999), Member of the Standing Executive Committee (2000-), Judicial Reform Foundation
- Member of the Executive Committee, Taiwan Association for Human Rights (2000-)
- Advisor and Convener, Lei Chen Public Interest Trust Fund for Human Rights and Democracy (2006-)
- Member of the Review Committee, Legal Aid Foundation (2005-)
- Vice Chairman of the Legal Practice Committee, Inter-Pacific Bar Association (IPBA) (1995-2000)
- Director, Arbitration Association of the Republic of China (2006-)
- Director, Taiwan Construction Arbitration Association (2001-2005)
- President, NYU Taiwan Alumni Society (2005-)
- Adjunct Professor, Chinese Culture University (1993-2003)
- Member, Supreme Court Academic Forum (1998-2001)
- Commissioner, Human Rights Advisory Commission, Office of the President (2004-2007)
- Commissioner, Human Rights Commission, Executive Yuan (2001-2008)
- Administrative Consultant, Executive Yuan (2006)
- Member, Petitions and Appeals Committee of the Research, Development, and Evaluation Commission, Executive Yuan (2001-2008)
- Member, Petitions and Appeals Committee of the Department of Health, Executive Yuan (2003-)
- Advisor, Government Procurement Complaint Review Board, Executive Yuan (2002-2003)
- Member, Review Committee for Cases related to Denial and Prohibition of exiting and entering Taiwan, Ministry of the Interior Affairs (2003-2006)
- Member of the Drugs Review Committee, Ministry of Justice (2006-)
- Member of the Criminal Law Research and Amendment Committee, Ministry of Justice (2006-2009)
- Member of the Promotion Review Committee, Ministry of Justice (2009-)
- Member of the Legal Advice Committee, Ministry of Education (2006-2009)
- Member of the Bar Exam Review Committee, Ministry of Examination (2009)
- Member of the Supervisory Subcommittee, Taipei Municipal Elections Commission (1994)
- Member of the Committee for Dealing with State Compensation Cases, Taipei City Government (1998)
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