Mac Barnett is the author of many books for children, including Extra Yarn, illustrated by Jon Klassen, a Caldecott Honor Book and winner of a Boston Globe-Horn Book Award; The Wolf, the Duck, and the Mouse, a New York Times bestseller; Sam and Dave Dig a Hole, a Caldecott Honor Book and winner of the E. B. White Read Aloud Award. Other titles include The Important Thing About Margaret Wise Brown, Chloe and the Lion, How This Book Was Made, Count the Monkeys, and Billy Twitters and His Blue Whale Problem. He is the co-author, with Jory John, of the New York Times bestselling series The Terrible Two. Mac lives in California.

Adam Rex is the multi-talented author of books for children, middle readers and young adults, as well as an accomplished illustrator. He has written such beloved picture books as School’s First Day of School (illustrated by Christian Robinson), has created both pictures and words for favorites like Are You Scared, Darth Vader?, Nothing Rhymes with Orange, and Frankenstein Makes a Sandwich; and he has illustrated books by bestselling authors like The Legend of Rock Scissors Paper by Drew Daywalt, Chloe and the Lion by Mac Barnett, and Chu’s Day by Neil Gaiman. The True Meaning of Smekday was his first novel, followed by Smek for President! and other books for middle and teen readers. He grew up in Phoenix, got a BFA from the University of Arizona, and now lives in Tucson.