For more than 15 years, David Stuart has been observing, campaigning, raising awareness and developing community and healthcare responses to what has come to be known internationally as ChemSex/PnP culture. He has played a leading role in the development of London’s pioneering ChemSex support services Antidote, Club Drug Clinic and CODE clinic; he currently manages the ChemSex support programmes at 56 Dean Street sexual health clinic in London. David has been instrumental in placing ChemSex issues firmly on international Public Health agendas, and his sexual wellbeing and ChemSex support models of care have been adapted for use and applied in many dozens of cities around the world. He has been consulted by the governments and public health bodies of many countries across the Americas, Europe and Australasia, including the World Health Organisation/UNAIDS.