Almost 40 years active in the field of transplantation: Research Fellow at the Max Planck Institute for Experimental Medicine in Göttingen, Germany studying the mechanisms of cardiopulmonary adaptation to exercise in heart transplantation - Heart Failure and Heart Transplant Cardiologist at the University of Münster, Germany and later after German Reunification in Leipzig, Germany - Medical Director of Eurotransplant International Foundation, Leiden, the organization responsible for organ allocation in eight European countries - currently: Medical Director of the German Organ Procurment Organization (DSO), Frankfurt/Main, Germany