Jonathan Shepherd is Professor of Oral and Maxillofacial Surgery at the University of Wales College of Medicine. His major contributions are in an unusual combination of dental science, injury research and criminology. He has shown the substantial extent to which violence which results in medical treatment is not reported to, or recorded by the police and prevalence of serious psychological sequelae such as post traumatic stress disorder in those injured in violence. He discovered that bar glassware was most frequently used in violence in the UK, established which glassware was used as weapons, and discovered the benefits in terms of injury prevention of a switch to toughened glassware. Consequently he led a campaign that persuaded the Home Office, the voluntary sector and manufacturers to switch bar glassware from annealed to toughened glass. This is a major contribution to public health.