NEW YORK (AP) — Author Mo Willems has sold millions of books and won many awards, but the accolade that means most to him is when a parent says their child read aloud for the first time from one ...

ABC NEWS: Mo Willems is among the most famous, creative and prolific author-illustrators of children's books of our time. He's been awarded three Caldecott Award honors.

Author Mo Willems has sold millions of books and won many awards, but the accolade that means most is when a parent says their child read aloud for the first time from one of his books.

Mo Willems is the author and illustrator, and now, he's created an exhibit with the Children's Museum of Pittsburgh, but it may not be what you'd expect.