Forschungsaufenthalte

1995	CENTER -Business and Research Institute of Tilburg University-
1998	EPFL Lausanne
2000	CENTER -Business and Research Institute of Tilburg University-
2001	OBERWOLFACH SEMINAR
2002	DAGSTUHL
2002	Karl-Franzens-Universität Graz
2003	OBERWOLFACH SEMINAR CENTER -Business and Research Institute of Tilburg University-
2004	University of New Mexico (Visiting Professor) SANDIA National Laboratories, Optimization Group Los Alamos National Laboratories, Bioscience Division Santa Fe Institute University of California at Berkeley DIMACS Center for Discrete Maths and Theoretical Computer Science Massachusetts Institute of Technolgy (MIT)
2005	Karl-Franzens-Universität Graz (Visiting Professor)
2006	Dagstuhl Military Academy Lisbon Karl-Franzens-Universität Graz