Tim Spector is Professor of Genetic Epidemiology at Kings College, London and Director of the TwinsUK Registry, which is one of the worlds richest data collections on 11,000 twins. He trained as a physician with a career in research, which since 1992 has demonstrated the genetic basis of a wide range of common diseases, previously thought to be mainly due to ageing and environment. Most recently his group have found over 400 novel genes in over 30 diseases, such as osteoporosis, osteoarthritis, melanoma, baldness, and longevity. He has published over 600 research articles in prestigious journals including Science and Nature. He coordinates many worldwide genetic consortia and is currently at the forefront of research with a highly competitive European Research Council Senior Investigator award to study Epigenetics – a new exciting research area into how genes can be altered. He is the author of several books for the scientific and public communities and presents regularly in the media.