Laura Numeroff is the author of the best-selling modern classic If You Give a Mouse a Cookie and the popular What Mommies Do Best and its sequels. She lives in Los Angeles, California. Lynn Munsinger has illustrated more than ninety books for children, many with her frequent collaborator Helen Lester. Lynn's art has brought beloved characters like Wodney Wat, Tacky the penguin, Fluffy the porcupine, and Sparky the sloth and more to charming life. She lives in Vermont.