Professor Jean-Michel Oppert, MD, PhD, is professor of Nutrition at University Pierre et Marie Curie, Paris, France. He is the head of the Department of Nutrition, Heart and Metabolism Division, at Pitié-Salpêtrière university hospital (AP-HP) in Paris. His current research interests include the measurement of physical activity and sedentary behaviour in health and disease including obesity, the investigation of environmental determinants of physical activity, eating habits and obesity, and lifestyle and physiological changes induced by obesity surgery. He has been or is involved in EU projects centred on obesity and/or physical activity such as Nugenob (FP5), ALPHA (DG SANCO), HOPE (FP6), SPOTLIGHT (FP7), METACRADIS (FP7). He is founding member and has been member of the Steering Committee of the Health Enhancing Physical Activity (HEPA)-Europe network supported by WHO Europe (2005-2012). He is past president of the European Association for the Study of Obesity (EASO). He has been member of the executive committee of the EASO from 2002 to 2012, as treasurer, president-elect and then president.