Vojtech Hainer studied medicine at the Faculty of General Medicine, Charles University in Prague. His career was associated with the Department of Medicine at The First Faculty of Medicine, Charles University in Prague for more than thirty years. From 2002-2011, he acted as a director of the Institute of Endocrinology in Prague. He co-founded the Obesity Section of the Czech Endocrine Society in 1987. In 1993, he co-founded the Czech Society for the Study of Obesity, of which he was the first president until 2002 and then vice-president until 2006. His extensive international responsibilities included council membership of the International Obesity Task Force (IOTF), the IOTF Working Group on Obesity Management (1996 – 2005), the Obesity Management Task Force of the European Association for the Study of Obesity (EASO)(2001 – ongoing, chairman: 2001 – 2006), and president of the EASO (2006 – 2009). He has been a member of the Editorial Boards: “Diabetes, Metabolism, Endocrinology and Nutrition” (1998 – ongoing), “Endokrynol. Otyl.” (2005 – ongoing), “Practical Doctor” (2006 – ongoing) and “Obesity Facts” (2008 – ongoing). He participated in organizing the European Congresses on Obesity, (member of international scientific committees, co-president of the 13th ECO in 2004), the Congresses on Controversies to Consensus in Diabetes, Obesity and Hypertension (CODHy), Central European Congresses on Obesity (CECON) and the Round Table Meetings on Obesity Management. He is an author of several textbooks on obesity and co-author of the Guidelines on Obesity Management in Europe. He has published more than 200 papers in medical journals, of them 135 appeared on PubMed. His research topics included: Very low energy diets (VLED), comprehensive obesity management and health risks in severely obese patients, factors affecting both short-term and long-term outcome of obesity treatment, genetic and environmental aspects of weight change in obesity, eating behavior and health risks, pathogenesis and health risks of obesity in adolescence, adenovirus infection and obesity, hormonal and metabolic response to bariatric surgery.