Professor of surgery and Consultan surgeon, PhD, Upper GI surgery, Dep Gastrointestinal surgery and Dep Obesity and Bariatric surgery, Oslo University Hospital. Head of the research group "Morbid Obesity" and the research group "Esophageal and gastric disorders" at Oslo University Hospital. Head of the Board for the National Registry of Bariatric Surgery in Norway (SOReg-N) and member of the board of The Norwegian Gastrointestinal Cancer Surgery Group. Editorial Board Member "Obesity Surgery", and Associate Editorial Board British Journal of Surgery and British Journal of Surgery OPen. Honory Fellow of European Board of Surgery (Upper GI section). Main focus: Bariatric surgery and gastric/esophageal cancer surgery