MO WILLEMS is the author of groundbreaking picture books, including: Knuffle Bunny: A Cautionary Tale (Caldecott Honor winner 2004); Don't Let the Pigeon Drive the Bus! (Caldecott Honor winner 2003); Time to Say "Please"!; Leonardo, the Terrible Monster; and Edwina, the Dinosaur Who Didn't Know She Was Extinct. In his previous life, Mo was a six-time Emmy Award winning writer and animator for Sesame Street and the creator of Cartoon Network's Sheep in the Big City. He lives with his family in Massachusetts.