Mac Barnett is a New York Times best-selling author of several books for children, including Sam and Dave Dig a Hole, the Shapes Trilogy, and many others illustrated by Jon Klassen. He is also the author of Just Because, illustrated by Isabelle Arsenault; A Polar Bear in the Snow, illustrated by Shawn Harris; John’s Turn, illustrated by Kate Berube; and Twenty Questions, illustrated by Christian Robinson. Winner of three New York Times/New York Public Library Best Illustrated Children’s Book Awards and the Boston Globe–Horn Book Award, Mac Barnett lives in Oakland, California.

Jon Klassen is the creator of the #1 New York Times best-selling I Want My Hat Back, which won a Theodor Seuss Geisel Honor, and its companions This Is Not My Hat, which won a Caldecott Medal and a Kate Greenaway Medal, and We Found a Hat. He is also the author-illustrator of The Rock from the Sky and The Skull, and the illustrator of Extra Yarn, Sam and Dave Dig a Hole, and the Shapes Trilogy, all by Mac Barnett. Originally from Ontario, Jon Klassen now lives in Los Angeles.