Stefan studied scriptwriting and dramaturgy at The Film Academy (FAMU) in Prague. He wrote several television films and plays, as well as the feature Only a Day (1988).
In 1992 he started to work for The International Film Festival Karlovy Vary creating The Forum of Independents, an important part of the main programme. In 2007 he established Prague Short Film Festival. Since 1998 he also works for the International Film Festival Mannheim-Heidelberg, where he was in charge of Co-production Meetings and in 2012 he became the member of The Program Committee.
In 2004 he produced for two documentaries, Souvenir, directed by Alice Nellis, and The Memorial Who Wasn´t, directed by Peter Kerekes.
He wrote for several Czech film magazines and newspapers, lectured about independent cinema at Prague Film school FAMU and Masaryk University in Brno and was member of several festival juries (Warsaw, Munich, Sofia, Potsdam, Pilsen, and in 2017 main jury of the Karlovy Vary film festival).