Look employed Stanley Kubrick as a staff photographer before he became a filmmaker. The American magazine hired him in 1946, first as an apprentice and later as a full-time staff photographer.
Kubrick had already sold a photographic series to Look while still a teenager. At the magazine, he developed a talent for visual storytelling through portraits, street scenes, boxing coverage, travel assignments, and photo essays. His work included images of boxer Walter Cartier, jazz musicians, and everyday life in American cities.
He produced more than 300 assignments for Look between 1946 and 1951, an experience that helped sharpen the observational eye and precise composition later visible in his films. His photographic background is especially relevant to his later reputation for meticulous framing and controlled visual design.
Kubrick left Look to pursue filmmaking, making short documentaries before directing features. Day of the Fight, about Walter Cartier, grew directly out of his magazine work. Vogue, Time, and Life were all prominent magazines, but none is the canonical answer to this question.