Magnum is the premier photojournalism agency. Magnum is a cooperative of nearly sixty photographers that was founded in 1947 by Robert Capa, David "Chim" Seymour, George Rodger and Henri Cartier-Bresson.

They have offices in London, New York, Paris, and Tokyo.

Magnum photographers have worked for nearly every major publication in the world over the past half century. The photographers are particularly well known for their photo essays.

Magnum maintains an archive of over a million images in color and black and white, dating from the 1930s until today.