Mac Barnett is the author of numerous books for children, including A Polar Bear in the Snow, illustrated by Shawn Harris; Just Because, illustrated by Isabelle Arsenault; President Taft Is Stuck in the Bath, illustrated by Chris Van Dusen; and several books illustrated by Jon Klassen, including Sam & Dave Dig a Hole, which received a Caldecott Honor and an E. B. White Read-Aloud Award; The Wolf, the Duck, and the Mouse; and the shape trilogy. Mac Barnett lives in California.

Kate Berube is the author-illustrator of Hannah and Sugar, which won the Marion Vannett Ridgway Award and the Oregon Book Award for Children's Literature, and Mae's First Day of School, which was a finalist for the Oregon Book Award for Children's Literature. Kate Berube lives in Oregon with her family.