Jon Klassen CM (born November 29, 1981)[1] is a Canadian writer and illustrator of children's books and an animator.

[6] Both books were on the New York Times Best Seller list for more than 40 weeks; by April 2014 one or the other had been translated into 22 languages and they had jointly surpassed one million worldwide sales.

"[23] According to the Chicago Tribune, "the joy of this book lies in figuring out the explicit plot from the implicit details in the pictures.

[2][4][c] According to the award committee, "With minute changes in eyes and the slightest displacement of seagrass, Klassen's masterful illustrations tell the story the narrator doesn't know.

According to the British judges, "The format and layout work perfectly to convey the underwater location with the movement of the action flowing with the water from left to right. ...

"[8] The Greenaway is paired in a London announcement and presentation ceremony with the Carnegie Medal for children's literature, which recognized a controversially grim young-adult novel in 2014.

"[5] Klassen illustrated The Dark (2013), written by Lemony Snicket, which made the Greenaway Medal shortlist of eight books alongside This Is Not My Hat.

[8][c][e]He teamed up with Mac Barnett again in 2014, on a picture book published by Candlewick, Sam and Dave Dig a Hole.