John Gabbay is Emeritus Professor of Public Health at the University of Southampton. After qualifying in medicine in 1974 he worked at the University of Cambridge on the historical and social origins of medical knowledge. As a public health physician in the 1980s in Oxford and London, he developed an interest in the organisation and management of acute health services, especially the interface between medicine and management, and was involved in the development and evaluation of clinical audit. From 1992 to 2004 he directed the Wessex Institute for Health R&D, and (1998-2004) the National Coordinating Centre for Health Technology Assessment. His main recent research has involved qualitative studies on how knowledge enters clinical practice and policy.