From Verified Handles
international photographic cooperative
Magnum Photos is an international photographic cooperative owned by its photographer-members, with offices in New York City, Paris, London and Tokyo.
Founding of agency
Magnum was founded in Paris in 1947 by Robert Capa, David "Chim" Seymour, Henri Cartier-Bresson, George Rodger and William Vandivert (all photographers), Rita Vandivert and Maria Eisner, based on an idea of Capa's. from Wikipedia
These are provided for reference and have been verified to be accurate.