Marion Debus, MD, received her medical training at Ruhr-University Bochum (1989–1995). Her professional training in internal medicine includes her years at Klinik Öschelbronn Germany, Princess of Wales Hospital Bridgend GB, and Gemeinschaftskrankenhaus Havelhöhe in Berlin, Germany. Between 2002 and 2005, Marion further specialized in hematology and oncology at Robert-Bosch-Krankenhaus in Stuttgart. From 2005 to 2017, she was senior physician at the anthroposophic community hospital Havelhöhe Berlin with a large oncological outpatient clinic. She is currently Head of the Department of Oncology, Hematology, and Internal Medicine at Klinik Arlesheim (Klinik-Arlesheim.ch) near Basel, Switzerland.