Nicholas Day is the author of The Mona Lisa Vanishes, illustrated by Brett Helquist, winner of the Robert F. Sibert Award and the Boston Globe-Horn Book Award for nonfiction; A World Without Summer, illustrated by Yas Imamura; and Nothing: John Cage and 4’33”, illustrated by Chris Raschka. For adults, he’s the author of Baby Meets World, a work about the science and history of infancy, which Mary Roach called “a perfect book.” He lives in Northampton, Massachusetts, with his family.