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Jonathan Shepherd is Emeritus Professor of Oral and Maxillofacial Surgery at Cardiff University. In addition to his considerable clinical work as a consultant, through his research Jonathan has been active in the field of criminology and its overlap with health. His research in this area has led to significant reductions in violence, initially in South Wales where he carried out the work but since then across the UK and in cities around the world. Jonathan pioneered the establishment of professional colleges for the police, probation and school teachers. Recently, he spearheaded a Declaration on Evidence, which was signed in November 2017 by leaders of all the Royal Colleges, the College of Policing and the Chartered College of Teaching and commits them to put evidence at the heart of their work.