Jeff Mack has written and illustrated a long list of picture books, chapter books, and early readers, including the Hippo and Rabbit series, Frog and Fly in Six Slurpy Stories, and the Clueless McGee books. His recent book, Good News, Bad News, has been published in twelve different languages and was described in a starred Publishers Weekly review as a "well-executed, rapid-fire book." He lives with his family in western Massachusetts.