By the 1930s, Fagg had moved to Los Angeles and was working as an art director for 20th Century Fox.
[2] Fagg became a commercial illustrator, working for several prominent New York advertising agencies and providing illustrations for national magazines including Life, Holiday, and the Saturday Evening Post.
[3][4] Several of his paintings are included in the United States Air Force Art Collection.
[5] Fagg may be best remembered today for his relatively brief stint providing painted covers for a 1950s science fiction magazine.
[1] In 2001, a New York Times review of a retrospective exhibition of futuristic art singled out Fagg's cover painting for the January 1954 If, praising its depiction of "a glowing submarine metropolis under interconnected glass domes, painted in a cheerfully colorful, cartoonish style".