A busy artist since the 1970s, Mayo has illustrated chapter books such as The Discontented Ghost, Dracula Go Home, and classic editions such as Jack London's novels as well as Atlas Shrugged. Mayo also illustrated Between the Lions coloring and activity books. His work has appeared in print magazines and advertisements.
- Guess Who Cards (1978)
- My Day on Sesame Street (1996)
- Christmas on Sesame Street (1997, watercolor book)
- Boo! Sticker Time (2000, sticker book)
- Let's Count (2002)
- ABC and Me (2002)