10/91-03/96: Diploma studies of mathematics and computer science at the University of Osnabrück
04/96-03/01: Teaching and research assistant in the Department of Mathematics at the University of Osnabrück
10/99: Ph.D. in mathematics (Dr. rer. nat.) at the University of Osnabrück
04/01-03/03: Software engineer at sd&m (software design & management) in Ratingen and München
04/03-09/08: Junior professor in the Institute of Computer Science at the University of Osnabrück
10/08-04/09: Substitute professor in the Institute of Mathematics at the Technical University of Clausthal
05/09-09/10: Professor of Combinatorial Optimization in the Institute of Mathematics at the Technical University of Clausthal
since 10/10: Professor of Combinatorial Optimization in the Institute of Computer Science at the University of Osnabrück