The most famous photographer in the world is Andreas Gursky.
Followed by other famous photographers such as Robert Mapplethorpe, Henri-Cartier Bresson, Annie Leibovitz, Sebastião Salgado, Brassaï, Ansel Adams and Robert Capa.
There are some other famous photographers but those are the most famous photographers in the world that top the list.
Some other famous photographers got started back in the 1900's and even as soon as cameras were invented.