Lewis Wolpert is a distinguished developmental biologist, and is Emeritus Professor in Cell and Developmental Biology at University College, London. He is the author of, among others, The Unnatural Nature of Science and Malignant Sadness, which was described by Anthony Storr as ‘the most objective short account of all the various approaches to depression’. His most recent book, You’re Looking Very Well: The Surprising Nature of Getting Old, was published in 2011.