George Roussos, a.k.a. George Bell entered comics in 1939 as letterer of the Spanish-language version of the newspaper panel Ripley’s Believe It or Not. In 1940, Bob Kane and Bill Finger hired him to assist inker Jerry Robinson on Batman stories. He and Robinson eventually left the Kane studio to work directly for National (DC Comics) on Batman, Vigilante, Johnny Quick, Superman, Starman, and as penciler of “Air Wave” in Detective Comics. He also did Golden Age work for Timely Comics, Avon Publications, Standard/ Better/Nedor, Fiction House, Hillman, Lev Gleason Publications, and Spark, and worked on numerous newspaper comic strips. Comic book clients during the 1950s included Atlas Comics, Crestwood, EC, and St. John Publications.
In the 1960s, Roussos used the pseudonym “George Bell” as Jack Kirby’s inker on landmark early issues of Marvel’s Fantastic Four, and inked Kirby’s return of Captain America in Avengers #4 (March 1964), as well as Kirby’s classic Sgt. Fury and his Howling Commandos. After doing some work for Warren Publishing’s black-and-white horrorcomics magazines in 1970 and 1971, Roussos — who was frequently the uncredited colorist on many Marvel Silver Age comics — became Marvel’s full-time staff colorist. [source: en.wikipedia.org]