The authors are a multidisciplinary team of senior and internationally recognised researchers from the Universities of London and Southampton. John Gabbay researches into the way that knowledge enters policy and practice in organisations. Andrée le May is renowned for her work on knowledge in practice. Catherine Pope is a distinguished qualitative methodologist with long experience in ethnographic research in healthcare. Glenn Robert specialises in organisational studies on quality and service improvement and large-scale change in healthcare. Paul Bate is a leading authority on organisational development and change management, including healthcare in the UK and USA. Mary-Ann Elston is a well-known researcher and teacher in medical sociology.