 He was an intern and resident in various French hospitals, including Department of Clinical Neurophysiology at Hôpitaux universitaires de Strasbourg where he served from 1973 to 1977 and from 1978 to 1980 respectively.Subsequently, Mangin was appointed as Attaché (Assistant in English) at the Institute of Legal and Social Medicine and then served on the Faculty of Medicine at the Louis Pasteur University as well as an Assistant Professor of Medicine at the same alma mater between 1981 an 1986.Following it, he became a Maître de conférences and medical practitioner at the Institute of Legal and Social Medicine, Faculty of medicine, University Louis Pasteur - Strasbourg I.