Mo Willems is an author and illustrator best known for his Elephant & Piggie and Pigeon books for early readers. Some of his most popular books include Don't Let the Pigeon Drive the Bus!, The Pigeon Needs a Bath, The Duckling Gets a Cookie?, Knuffle Bunny, and Hooray for Amanda & Her Alligator. He maintains websites with information about his books, characters, and videos further exploring his stories.