Cindy Neuschwander is a retired elementary school teacher who was inspired to write the Sir Cumference series while visiting medieval castles in England. She now works at California Polytechnic State University. She lives in San Luis Obispo, California.

Wayne Geehan is the illustrator of Multiplying Menace, Cut Down to Size at High Noon, and the Sir Cumference series. He lives in Acton, Massachusetts.