Author and illustrator known for creating The Adventures of Beekle: The Unimaginary Friend. For this book he received the 2015 Caldecott Medal for his illustrations.
He received a bachelor's degree in microbiology from the University of California San Diego.
His first book to be published was the children's book The Guild of Geniuses.
He is originally from Brooklyn, New York.
He collaborated with children's book author Dan Gutman on The Christmas Genie.