Jean-Marc Kaufman obtained his MD and PhD degrees at the Ghent University in Belgium and he was a senior postdoctoral research fellow at the University of Texas Medical School at Houston. He is board certified in Endocrinology and in Nuclear Medicine. He is staff member of the Department of internal medicine since 1985 and professor of Medicine since 1993 at the Ghent University Hospital, where he is established in collaboration with the Department of Rheumatology and the Unit for Osteoporosis and Metabolic Bone Diseases. He is presently head of the section of Endocrinology, director of the Laboratory for Hormonology and acting chair of the Department of internal medicine. Main research interests are in the clinical aspects of regulation and action of sex steroids with focus on hormonal changes with aging in men and osteoporosis in men. He is (co) author of more than 150 publications in international peer reviewed journals.