John Drury is Professor of Social Psychology at the University of Sussex who specializes in crowds and mass emergency behaviour. He has published over 70 peer-reviewed journal articles and have published on events including the Hajj (Mecca), the London bombings of July 7th 2005, the Hillsborough disaster, the 2010 Chile earthquake, and the 2011 English riots. He teaches crowd psychology to the UK Fire and Rescue Service as part of National Resilience training. His research on mass emergencies has informed the training of over 2000 crowd safety managers and stewards across the UK and European football clubs. His work with Public Health England on CBRN mass decontamination is included in international guidance. He was a consultant on the Civil Contingencies Secretariat’s National Risk Assessment. He heads the Crowds & Identities group at Sussex and is currently the editor of the British Journal of Social Psychology.