Mary Brigid Barrett has written and illustrated many award-winning picture and board books, including Shoebox Sam. In addition, she served as creative editor for Our White House: Looking In, Looking Out and The Exquisite Corpse Adventure, published by Candlewick Press. She is the president and executive director of The National Children's Book and Literacy Alliance. She lives in Lincoln, Massachusetts.

LeUyen Pham is the author-illustrator of Big Sister, Little Sister and has illustrated many other books for children, including the New York Times bestseller Grace for President by Kelly DiPucchio. With Candlewick Press, she illustrated God’s Dream by Archbishop Desmond Tutu and Douglas Carlton Abrams and Aunt Mary’s Rose by Douglas Wood. She lives in San Francisco.