Mo Willems is a three-time Caldecott Honor winner (for Don't Let the Pigeon Drive the Bus!, Knuffle Bunny, and Knuffle Bunny Too). He also won two Geisel Medals for There Is a Bird on Your Head! and Are You Ready to Play Outside? He has published many popular titles, including, most recently, Knuffle Bunny Free: An Unexpected Diversion and the New York Times bestselling Cat the Cat books. Before he turned to making books, Mo was a writer and animator on Sesame Street, where he won six Emmys. Mo lives with his family in Massachusetts.