Aboriginal Australia is a tough place to work, rough and tough.

My first priority when taking pictures is to achieve clarity. A good documentary photograph transmits the information of the situation with the utmost fidelity; achieving it means understanding the nuances of lighting and composition, and also remembering to keep the lenses clean and the cameras steady.

In my first class at the University of Kentucky, my American Literature professor came in, and the first sentence out of his mouth was "The central theme of American Literature is an attempt to reconcile what we've done to the New World." wrote that down in my notebook, and thought, "What is he talking about?" But that's what I think about now. The New World and what we've done to it.

There are grander and more sublime landscapes - to me. There are more compelling cultures. But what appeals to me about central Montana is that the combination of landscape and lifestyle is the most compelling I've seen on this earth. Small mountain ranges and open prairie, and different weather, different light, all within a 360-degree view.

When I first went to 'National Geographic,' I thought I was the least qualified person to step through the doors. But because of my parents and the culture of continual learning they imposed on us, I later came to believe I was the most qualified person who ever worked there.

That statement [ Stephen Ambrose:'You, Sam, have the hardest job, which is, pretend like nothing has happened in the last 200 years.'] woke me up to the fact that the landscape that Lewis and Clark came across was greater than the Serengeti. And it's gone.

I wanted life to be episodic. I wanted to be a magazine photographer and I was willing to do what it took to become that.