Where does one start? There are so many -
Landscapes - Ansel Adams, Eliot Porter, Galen Rowell, Art Wolfe, the Caponigros, Michael Frye, DeWitt Jones...
Street photography - Henri Cartier-Bresson, Garry Winogrand, William Klein...
Wildlife - Art Wolfe, George Lepp, Andy Biggs, John Shaw...
I would suggest you look on Google using such search terms as "famous wildlife photographers", "famous landscape photographers", etc. and I am sure you will find a lot of folks. My list above is very small as I could go on and on, because there are so many, depending on the area of interest that you choose. Some of them are folks that are seen by all as "masters" of the art, whereas others are probably not that well known and yet produce incredible images in the field of specialization, for example I would refer you to such Canadian photographers as William Keay, Daryl Benson and Dr. Wayne Lynch. I am sure that every country has its "unsung" photographers in the various fields and some of them even shoot a variety of subject areas. Also, you should remember that "wildlife photography" is one subset of what might be called "Nature photography" - animals, birds, flowers, etc. A lot will depend on how you define "wildlife photography" for yourself to determine whose photography you might be interested in reviewing. You can check these out -
http://www.rwongphoto.com/blog/top-10-influential-nature-photographers-alltime/. My 0.02¢ FWIW.
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WesternGuy