There are many famous photographers in the world that were born years ago and sadly now have died.
But the ones I know of that are the most famous photographers in the world are, Ansel Adams, Henri Cartier Bresson, Dorothea Lange, Steve Mcurry, Robert Capa, Richard Avedon, Annie Leibovitz, Diane Arbus, Robert Frank, Elliot Erwitt, Edward Weston, Irving Penn, Alfred Stieglitz and Margaret Bourke-White.
There are likely several more famous photographers in the world but those come off the top of my head of who I know to be the most famous photographers.