Bill Hayes is a writer, photographer and contributor to the New York Times. He is the author of Insomniac City: New York, Oliver, and Me, an intimate glimpse into his relationship with the late Oliver Sacks. He is currently at work on a new book, Sweat: A History of Exercise, as well as a collection of his New York street photography. His other books include Sleep Demons; Five Quarts; and The Anatomist. Hayes is a recipient of a Guggenheim Fellowship in nonfiction, and has been a Visiting Scholar at the American Academy in Rome. According to the New York Times, Hayes ‘has an unusual set of skills ... He is part science writer, part memoirist, part culture explainer.’