Gareth Williams is Emeritus Professor and former Dean of Medicine at the University of Bristol. His previous books for general readers are Angel of Death: The Story of Smallpox (shortlisted for the Wellcome Book Prize of 2010), Paralysed with Fear: The Story of Polio and A Monstrous Commotion: The Mysteries of Loch Ness. He is a past president of the Anglo-French Medical Society and has an honorary doctorate from the University of Angers. He is often to be found playing the flute or saxophone in and around Bristol.