1996 - 2000
International Association of Pancreatology Consultant, Swiss Society for Visceral Surgery Board member, Surgical Biology Club III of the American College of Surgeons Member, International Association of Pancreatology (IAP) Treasurer, International Hepato Pancreato Biliary Association (IHPBA)
Chair of the Scientific Advisory Board, German Society for Digestive and Metabolic Diseases DGVS Board member, Swiss Society for Visceral Surgery President, German Society for Surgery DGCH Member Commission for Clinical Studies
1988 - 1994
Gastroenterological Colloquium of the University of Ulm Organization, European Pancreatic Club Member of the selection committee, German Society for Digestive and Metabolic Diseases (DGVS) Member of the program committee, European Pancreatic Cancer Study Group Secretary, German Pancreas Working, German Society for Surgery Secretary of the Surgical Forum Group Scientific Beira