Bonnie Worth is the author of countless books for young readers, among them the Cat in the Hat Learning Library books Oh Say Can You Say Di-No-Saur?; Hark! A Shark!; and If I Ran the Horse Show. She is also the author of the Lorax nonfiction book Hug a Bug: How YOU Can Help Protect Insects.

New Jersey native and "constant scribbler" ARISTIDES ("Art") RUIZ has illustrated over 100 books for children—among them 40+ books in the Cat in the Hat's Learning Library series. A versatile artist, he divides his time between illustrating for children and fine art painting because . . . he's a scribbler. He's constantly scribbling.