Alvin Tresselt (1916-2000) was a children's book author whose books have sold more than a million copies. White Snow, Bright Snow, illustrated by Roger Duvoisin, won a Caldecott Medal in 1948. Tresselt was also the editor of Humpty Dumpty Magazine and the executive editor and vice president of Parents' Magazine Press from 1967 to 1974.

Roger Duvoisin (1900-1980) was born to a French-Swiss family in Geneva, where he began a career in art and textile design before immigrating to the United States in 1925. Duvoisin collaborated with many writers, including his wife, Louise Fatio Duvoisin, and Alvin Tresselt, with whom he won a Caldecott Award for White Snow, Bright Snow in 1948 and the Caldecott Honor Award for Hide and Seek Fog in 1966. He is best known for his classic of children's literature, Petunia.