After graduating from the University of Copenhagen with a MSC in Human Biology, Dr. Clemmensen joined a PhD program at the Institute for Drug Design and Pharmacology at the University of Copenhagen, under the direct supervision of Prof. Hans Bräuner-Osborne. Christoffer did his postdoctoral training with Prof. Matthias Tschöp at the Institute for Diabetes and Obesity at the Helmholtz Diabetes Center in Munich, Germany, where he later became a Group Leader of the Drug Development Unit.