About the Author Mo Willems, a number one New York Times best-selling author and illustrator, has been awarded three Caldecott Honors for his picture books, two Theodor Seuss Geisel Medals, and five Geisel Honors for his celebrated Elephant & Piggie series. He lives in Massachusetts with his family. Learn more at pigeonpresents.com. Mo Willems, a number one New York Times best-selling author and illustrator, has been awarded three Caldecott Honors for his picture books, two Theodor Seuss Geisel Medals, and five Geisel Honors for his celebrated Elephant & Piggie series. He lives in Massachusetts with his family. Learn more at pigeonpresents.com.