Justice, Judicial Yuan (2003-2011)
Dean, College of Law, National Taiwan University (2002- 2003)
Commissioner, Fair Trade Commission, Executive Yuan, R.O.C. (1995-1998)
President, Taiwan Law Society (32nd, 33rd)
Associate Professor, Department of Law, Fu-Jen Catholic University (1986-1987)
Adjunct Associate Professor, Adjunct Professor, Department of Law, Fu-Jen Catholic University (1987- 2011/9/30, 2013/2-)
Professor, Department of Law, National Taiwan University (1992-2003, 2013/2-2016/10/31)
Adjunct Professor, Department of Law, National Taiwan University (2003-2013/2, 2016/11/1-)
Professor, Department of Law, Fu-Jen Catholic University (2011/10/1-2013/2)