Mary Serfozo is the author of several picture books, including Who Said Red? and What's What? A Guessing Game, both illustrated by Keiko Narahashi. She and her husband have two children and three grandchildren, and live in a solar home in Paso Robles, California.

Valeria Petrone has illustrated several books for children, including Ducks in Muck by Lori Haskins, Say Cheese! by Nancy Smiler Levinson, and Uh-Oh! by Marion Dane Bauer. She is the illustrator for Plumply, Dumply Pumpkin by Mary Serfozo and, most recently, illustrated Way Down Deep in the Deep Blue Sea. She currently lives in Italy.