Mo Willems is the author of the Caldecott Honor-winning books Don't Let the Pigeon Drive the Bus!, Knuffle Bunny and Knuffle Bunny Too as well as the Theodor Seuss Geisel Medal-winning Elephant and Piggie books. An acclaimed animator and television script-writer, he has won six Emmy awards for his writing on Sesame Street and is also the creator of Sheep in the Big City. Mo lives with his family in Massachusetts, USA.