Stefan Petersen studied physics in Kiel and Hannover where he graduated in mathematical physics. He works as a researcher at the Leibniz Institute for Science and Mathematics Education at the University of Kiel acting as the head of the German Physics Olympiad. In 2008 he became a member of the Advisory Board of the International Physics Olympiad. Stefan Petersen has been involved in the European Union Science Olympiad since the beginning in 2003 and was a member of the Academic Committee for the EUSO 2007. He is now one of the Vice-Presidents of the competition. ln addition he also takes part in the selection and training of the German teams for the International Junior Science Olympiads.