Professor Kjaer is a professor at the University of Copenhagen and a chief physician at the Department of Clinical Physiology, Nuclear Medicine & PET at Rigshospitalet, the National University Hospital of Denmark.
Professor Kjaer is a former president of the Scandinavian Society of Clinical Physiology and Nuclear Medicine (SSCPNM) and served on the Scientific Committee of the Danish Cancer Society and the European Association of Nuclear Medicine (EANM) Oncology Committee. He is currently a member of the scientific advisory board of the European Neuroendocrine Tumor Society (ENETS) and a member of the Industrial Research Committee of the Innovation Fund Denmark. Professor Kjaer is founding Editor-in-Chief of Diagnostics (Basel), head of the Cluster for Molecular Imaging, and director of the Postgraduate School for Medical and Molecular Imaging at the Faculty of Health Sciences, University of Copenhagen. He is an elected member of the Danish Academy of Technical Sciences and a Knight of the Order of Dannebrog, a Danish Royal Order of Chivalry.
Professor Kjaer has published more than 500 peer-reviewed articles and received numerous prestigious scientific awards over the years.