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