Wayne Hall is Emeritus Professor at the National Centre for Youth Substance Use Research at the University of Queensland. He was a Visiting Professor at the National Addiction Centre, Kings College London (2009-2019), the London School of Hygiene and Tropical Medicine (2010-2021); and the National Drug and Alcohol Research Centre, UNSW (since 2001). Wayne has advised the World Health Organization on: the health effects of cannabis use; the effectiveness of drug substitution treatment; the scientific quality of the Swiss heroin trials; the contribution of illicit drug use to the global burden of disease; and the ethical implications of genetic and neuroscience research on addiction.