Diane deGroat is the illustrator of more than 120 children's books and the author-illustrator of bestselling books about Gilbert, including Ants in Your Pants, Worms in Your Plants! (Gilbert Goes Green); April Fool! Watch Out at School!; Mother, You're the Best! (But Sister, You're a Pest!); Last One in Is a Rotten Egg!; and the New York Times bestseller Roses Are Pink, Your Feet Really Stink. Diane lives in Amherst, Massachusetts.