Tim Spector is Professor of Genetic Epidemiology at King’s College London, Hon Consultant Physician at Guy’s and St Thomas’ Hospital, and Director of the TwinsUK Registry. He has won several academic awards and published over 700 academic papers, many of which relate directly to nutrition and the causes of obesity. He has appeared in numerous TV documentaries and is often consulted in UK and international media on his team’s research. Since 2014 he has been leading the largest UK’s largest open-source science project British Gut to understand the microbial diversity of the human gut. Tim Spector’s book on epigenetics, Identically Different, was longlisted for the Wellcome Trust Prize and shortlisted for the Transmission Prize.