Mark Tarrant is Professor of Psychology at the University of Plymouth, UK. His work focuses on the development and evaluation of group-based behaviour change interventions for supporting health. He has published more than 70 articles and book chapters, including in leading international journals (e.g., Psychological Science, Health Psychology Review), and has been funded by major research councils (e.g., NIHR, MRC, ESRC) and charities (e.g., Stroke Association).