Jon Klassen is a Canadian-born author/illustrator of picture books. He started his career in animation, working as an illustrator and designer for feature films at Dreamworks and Laika Studios, and smaller projects like commercials and music videos, with clients including the BBC and U2, before moving his focus to book work.

His own books include I Want My Hat Back, This is Not My Hat, winner of the Caldecott Medal, and We Found A Hat. His illustrated books include Extra Yarn and Sam and Dave Dig A Hole both written by Mac Barnett and winners of Caldecott Honors.

He is a member of the Order of Canada for contributions to children's literature. He currently lives and works in Los Angeles with his wife Moranne and two sons, Isaac and August.