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. He will be at Portland Book Festival 2023 celebrating two new books: the picture book How Does Santa Go Down the Chimney?, with Jon Klassen; and The First Cat in Space and the Soup of Doom!, with Shawn Harris.