Stefan graduated with a Diplom in Informatics from the University of Oldenburg, Germany and spent one year as a visiting scholar at the Computer Science Department of the University of Southern California, Los Angeles, USA. In 1997, he joined the information and database systems research group of Gregor Engels at the University of Paderborn. Since 2005, he is senior researcher and executive manager of s-lab - Software Quality Lab there. He completed the doctoral program at the Faculty of Computer Science, Electrical Engineering, and Mathematics. Focus of his research is on model-based software engineering methods and software quality engineering.