Ornella Corazza, MA, PhD, is a Reader in Substance Addictions and Behaviours at the University of Hertfordshire (UK), where she leads a multidisciplinary team across a diverse portfolio in public health and drug policy research. Results of her work have been presented in over a hundred peer-reviewed publications, policy reports and invited lectures internationally. Andres Roman-Urrestarazu, MD, PhD, specializes in the crossover of psychiatry, substance abuse, health economics, and international health policy. He is currently Gillings Fellow in Global Public Health at the University of Cambridge (UK) and assistant professor at Maastricht University (Netherlands). He has held appointments at Trinity Hall, Cambridge and the London School of Economics and Political Science, working extensively on substance misuse and New Psychoactive Substances.