Henri Cartier-Bresson became known for “the decisive moment,” an instantaneous composition of a scene, for which the photographer must act quickly and intuitively. As a photojournalist for Magnum Photos, the agency he founded with his colleagues Robert Capa and David “Chim” Seymour, he traveled across the world, photographing some of the most important events of the 20th century. Early in his career, he developed a distinct style of photography and made some of his most famous and enduring images.