Professor of surgery/consultan surgeon, PhD, Head Section of Upper GI surgery, Dep Gastrointestinal surgery, Oslo University Hospital. Head of the research group "Esophageal and gastric disorders and bariatric surgery" at Oslo University Hospital. Head Board National Registry of Bariatric Surgery in Norway (SOReg-N) and Deputy head Board of The Norwegian Gastrointestinal Cancer Surgery Group. Editorial Board Member "Obesity Surgery", "Scandinavian Journal of Surgery", "Scandinavian Journal of Gastroenterology", and member Associate Editorial Board "British Journal of Surgery" and "British Journal of Surgery Open". Member ISDE Clinical Guideline Committee. Honory Fellow of European Board of Surgery (Upper GI section) and member of European Surgical Association (ESA). Main clinical and research focus: Bariatric surgery and gastroesophageal cancer surgery