Professor Willem J.J. (Pim) Assendelft is trained as general practitioner and as epidemiologist. He is professor in Prevention in Healthcare. Previously he was head of the department of Primary and Community Care of the Radboud University Medical Center. His research focuses on prevention (connection between public health and primary care), organization of care and outcomes research (trials in complex interventions, research synthesis). Previously, he was director of the Dutch Cochrane Centre, head of guideline development of the Dutch College of General Practitioners and he was a professor in Leiden. Within the Netherlands he was member of several grant committees of Netherlands Organization for Health Research and Development (ZonMw). In his previous position in Leiden he was chair of the university research profile Health, Prevention and the Human life cycle and chair of the research profile Innovation in health strategy and quality of care of the Leiden University Medical Center. In Nijmegen he is board member of the Radboud research priority theme "Healthcare improvement science".