From 1992 to present he has more or less worked as physician in Clinical Lipidology at Lipid Clinic, Medical Department, Rikshospitalet, partly responsible for the clinical research section at the clinic. From 2009-1011 he was consultant in Pharmacivigilance at the Norwegian Medicines Agency in Norway. The university carrier started in 2011 at the Department of Nutrition, University of Oslo as professor from 2013. In 2014, he became Head of the Center for Clinical Nutrition, University of Oslo and Oslo University Hospital.