Christhoper Rule was working as an advertising artist and book illustrator in the 1920s and 1930s. He worked in the comic book field in the 1940s and 1950s. He inked features for Fawcett, but was mainly active for Timely/Atlas. He inked many features, including Jack Keller's back-ups in 'Rawhide-Kid' and many of Jack Kirby's work during the "Silver Age". He was also a penciler on romance, horror and mystery titles. He was a longtime artist on 'Patsy Walker' (1945-1950s) and drew a feature called 'Famous Explorers of Space' in Space Squadron.