Adelaide Holl has written or illustrated more than forty children's books. She has worked as a writer and educational consultant for the Artists and Writers Press in New York and as an editor for Random House. Roger Duvoisin (1900-80) was the author and illustrator of more than forty children's books, including the Happy Lion and Petunia series and White Snow, Bright Snow, which was awarded the Caldecott Medal in 1948.