Harry Sumnall is Professor of Substance Use at the Public Health Institute at Liverpool John Moores University. His PhD was in psychopharmacology, but he is interested in all aspects of substance use, particularly in relation to young people. Harry’s funded research programmes have examined the evidence base for substance misuse prevention and the mechanisms for implementing evidence based practice and policy. Harry is a member of the UK government’s Advisory Council on the Misuse of Drugs, and a Board Member of the European Society for Prevention Research.