Susan Michie, FMedSci, FAcSS is Professor of Health Psychology and Director of the Centre for Behaviour Change at University College London. She is co-Director of NIHR’s Behavioural Science Policy Research Unit and leads UCL’s membership of NIHR’s School of Public Health Research. Her research focuses on behaviour change: how to understand it theoretically and apply theory to complex intervention development, evaluation and implementation. Her research includes the Human Behavior Change Project and Complex Systems for Sustainability and Health. She serves as an expert advisor to Public Health England and the UK Department of Health and Social Care.