Triangle

Mac Barnett is the author of several books for children, including Extra Yarn, illustrated by Jon Klassen, a Caldecott Honor Book and winner of a Boston Globe-Horn Book Award, and Sam and Dave Dig a Hole, a Caldecott Honor Book and winner of the E. B. White Read Aloud Award. He is the co-author, with Jory John, of the New York Times best-selling series The Terrible Two. Mac Barnett lives in California.

Jon Klassen is the author-illustrator of I Want My Hat Back, a Theodor Seuss Geisel Honor Book; This Is Not My Hat, winner of the Caldecott Medal and the Kate Greenaway Medal; and We Found a Hat. He is also the illustrator of two Caldecott Honor Books, Sam and Dave Dig a Hole and Extra Yarn, both written by Mac Barnett. Jon Klassen lives in Los Angeles.