I did it once, and National Geographic recruited me. I did it primarily out of curiosity. A lot of legendary photographers had worked on that campaign. Ernst Haas had done the early photography, and I knew him. There's a lore in photography about that campaign, and I was curious.

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.

Photography, alone of the arts, seems perfected to serve the desire humans have for a moment - this very moment - to stay.

Richard Prince's most famous photograph was made by me.

The longer we lived with it the more we wanted something less about process and more about life.

I did a story for the Geographic on Meriwether Lewis and William Clark, and Stephen Ambrose was the writer. He said, "I've got the easiest job in the world. I just have to re-tell the story of the greatest fishing, camping, hunting, canoeing trip of all time. You, Sam, have the hardest job, which is, pretend like nothing has happened in the last 200 years.

I'm interested in smokers standing on ledges, and big box stores, the rise of the suburbs, and the hollowing out of small towns. Self-storage. Things that didn't exist 50 years ago. Our common culture. What we have agreed is OK to live with.