Trisha Greenhalgh OBE is Professor of Primary Health Care at University College, London and a practising GP. Her main areas of interest are: Web based teaching and learning, especially for health care professionals; Evidence-based health care and quality improvement, especially in relation to multiprofessional and interdisciplinary working; Health service management, especially organisation, delivery and evaluation of diabetes services in primary care; Use of personal narrative to explore the patient's perspective and illness experience, especially in relation to diabetes in minority ethnic groups. Professor Greenhalgh has published over 80 papers in peer reviewed journals, is co-author of four other books and publishes a regular column in the British Medical Journal.