 Till 1989, a professor of law at the Tartu State University, then elected to the Supreme Soviet of the Soviet Union (was a candidate of the Popular Front of Estonia).After the dissolution of the Soviet Union he taught at the University of Notre Dame in the United States till 2000, after that at the University Nord in Tallinn (as the Dean of the Law School and the Vice President).Served as research fellow at the Woodrow Wilson Center in Washington D.C.