**Mac Barnett is the author of three books illustrated by Jon Klassen: Extra Yarn,which won a Caldecott Honor and a Boston Globe-Horn Book Award; Sam and Dave Dig a Hole,which won a Caldecott Honor and an E. B. White Award; and Triangle.With Jory John, he is the co-author of the New York Times best-...

**Mac Barnett is the author of three books illustrated by Jon Klassen: Extra Yarn,which won a Caldecott Honor and a Boston Globe-Horn Book Award; Sam and Dave Dig a Hole,which won a Caldecott Honor and an E. B. White Award; and Triangle.With Jory John, he is the co-author of the New York Times best-selling series The Terrible Two. Mac Barnett lives in California.Jon Klassenis 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 also illustrated two Caldecott Honor Books, Sam and Dave Dig a Hole and Extra Yarn,as well as Triangle, all written by Mac Barnett. Jon Klassen lives in Los Angeles.