Henri Cartier-Bresson was a French humanist photographer considered a master of candid photography, and an early user of 35 mm film. He pioneered the genre of street photography and viewed photography as capturing a decisive moment.
https://www.google.com/search?q=Henri+Cartier-Bresson&tbm=isch&ved=2ahUKEwiXr4P2pIPoAhVJ4oUKHUqPCe4Q2-cCegQIABAA&oq=Henri+Cartier-Bresson&gs_l=img.3..35i39l2j0i67l3j0l5.19969.19969..21658...0.0..0.80.80.1......0....1..gws-wiz-img.sejmT2jDFzc&ei=RupgXpf0GMnElwTKnqbwDg&bih=1260&biw=1640
https://www.amateurphotographer.co.uk/iconic-images/dessau-1945-informer-henri-cartier-bresson-iconic-photograph-15527