Picture book
In 1938, the American Library Association (ALA) began presenting annually the Caldecott Medal to the most distinguished children's book illustration published in the year. The Caldecott Medal was established as a sister award to the ALA's Newbery Medal, which was awarded to a children's books "for the most distinguished American children's book published the previous year" and presented annually beginning in 1922. During the mid-forties to early fifties, honorees included Marcia Brown, Barbara Cooney, Roger Duvoisin, Berta and Elmer Hader, Robert Lawson, Robert McCloskey, Dr. Seuss, Maurice Sendak, Ingri and Edgar Parin d'Aulaire, Leo Politi, Tasha Tudor, and Leonard Weisgard.
Caldecott Medal
Jon Klassen became the second person to win both the Caldecott and the Greenaway and the first to win both for the same work: "This Is Not My Hat" won the Caldecott in 2013 and the Greenaway in 2014. It was released on October 9, 2012, by Walker Books in the UK and by its American subsidiary Candlewick Press in the US.