Olivier Follmi from France has got to be the best photographer of extremely hard to get to places like Zanskar valleys, and of ethnic people, particularly in the Himalayas. He captures the awe-inspiring beauty of the himalayas, and the hard-working peoples who manage to survive there, and their beautiful monasteries.
his websites are in French, but easy to navigate even if you don't read French.
his photography website:
his general website: