Harry Sumnall is a Professor in Substance Use at the Public Health Institute, Liverpool John Moores University. He is interested in all aspects of substance use, particularly those related to young people’s health and wellbeing. Harry’s funded research programmes have examined the evidence base for substance misuse prevention, and he is interested in the mechanisms for support implementation of evidence based practice and policy. Harry is a Board Member of the European Society for Prevention Research (EUSPR), a trustee of the drug and alcohol prevention charity Mentor UK, and a scientific advisor to the MIND Foundation. He was a member of the Advisory Council on the Misuse of Drugs (ACMD) between 2011 and 2018.