Join Sir Cumference, Lady Di of Ameter, and their son Radius for wordplay, puns, and problem solving in these geometry-packed math adventures. Cindy Neuschwander is an elementary school teacher who loves teaching math. She also enjoys traveling, reading, and writing stories. She thought up Sir Cumference while visiting medieval castles in England, where she used to live. Cindy is a native Californian born in San Diego, but she has lived in many places, including Hawaii, Austria, and Germany. She currently lives in Pleasanton, California.