A longtime favorite, Jon Klassen has done something no picture-book author/illustrator has done before with his 2012 bestseller, “This is Not My Hat.”

This week, “Hat” received the Kate Greenaway Medal, a British literary award that annually recognizes “distinguished illustration in a book for children.”

Quirky and off-the-wall, “This is Not My Hat” nabbed the Caldecott Medal in 2013. No picture book in history has ever received the Caldecott and Greenaway awards. The book is a follow-up to his wildly popular "I Want My Hat Back."

In addition to authoring and illustrating his own books, Klassen has collaborated with a number of authors. He illustrated “Extra Yarn” in 2012, which was written by Mac Barnett, and was a Book Buzz Pick.

In October, the successful duo has another book pubbing with Candlewick Press—“Sam and Dave Dig a Hole.”