Prof Gerry Stimson is a public health social scientist, with over 40 years’ experience of research and advocacy. He was one of the founders of drugs harm reduction in the 1980s and helped develop and evaluate harm reduction in the UK as a response to HIV/AIDS. He has advised the UK Government, World Health Organization, UNAIDS, UNODC, World Bank and numerous governments on issues relating to drugs, HIV infection and AIDS, and alcohol. He is an advocate for tobacco harm reduction as a key public health strategy for reducing smoking related harms. He was a member of the UK National Institute for Health and Clinical Excellence guidelines group on tobacco harm reduction, and is a member of the British Standards Institute working group on e-cigarette standards. He helps organise the Global Forum on Nicotine conference. He has published over 220 scientific publications and several books. He is Honorary Professor at the London School of Hygiene and Tropical Medicine, Emeritus Professor at Imperial College London, and recent past Editor of the International Journal of Drug Policy. He was Executive Director of the International Harm Reduction Association from 2004 to 2010.