Martha Freeman has been marching since she was in middle school. Her 30 children's books include Mrs. Wow Never Wanted a Cow, Zap!, and Effie Starr Zook Has One More Question. She has three children and lives in Philadelphia. Violet (Jung Ah) Kim received a BFA degree in Illustration from the Rhode Island School of Design and is the illustrator of Earth Day, Birthday! (Two Lions) and The Little Gray Bunny (Charlesbridge). She lives in Seoul, South Korea.