Born in Quebec, Roy he emigrated to the United States where he studied at the School of Industrial Art and Pratt Institute.
Roy got his first job in comics in 1940, as an assistant[clarification needed] to Sub-Mariner artist Bill Everett.
His first strip, for the New York Herald Tribune Syndicate, was an adaptation of the Leslie Charteris character The Saint, which he drew from 1948 to 1951.
He also illustrated the comic strip Nero Wolfe for Columbia Features in the 1950s, and worked as a ghost artist for Flash Gordon.
Roy's final work was a hardcover graphic novel, Screaming Eagle, published posthumously in 1999 by Discovery Comics.