Professor of criminal law in the Jagiellonian University, Chairman of Institute of Criminal Law of the Jagiellonian University, Chairman of the Committee for Codification of Penal Law, Vice- chairman of the National Electoral Commission in elections 4.06.1989, Judge of the Constitutional Tribunal and President of the Constitutional Tribunal (1993 – 1997), Chairman of the Legislative Council of the Prime Minister (1998-2000), Commissioner for Citizens' Rights (2000-2006), Chairman of the National Electoral Commission (1990-1993), Vice- chairman of the Committee for Reform of Penal Law.
