After some initial training in mathematics and fundamental physics (Ecole Polytechnique, Paris), Bruno Falissard engaged in medical studies and specialized in Child and Adolescent Psychiatry in 1991. His PhD was in biostatistics and his post doc in psychometrics and exploratory multimensional methods. He was assistant professor in child and adolescent psychiatry in 1996-1997, associate professor in Public Health in 1997-2002 and full professor in Public health from 2002. He is at the head of the “Center of Epidemiology and Population Health” (500 members). He is co-author of more than 400 papers and author of 4 books. He has a clinical activity in child and adolescent psychiatry. His personal areas of research are about methodology and epistemology of mental health research. In 2015 he became president of IACAPAP (International Association of Child and Adolescent Psychiatry and Allied Professions, the term ended in 2018) and member of the French Academy of Medicine.