Above all, it's hard learning to live with vivid mental images of scenes I cared for and failed to photograph. It is the edgy existence within me of these unmade images that is the only assurance that the best photographs are yet to be made.

I can't speak for other photographers, but the photographers who went forward strongly when the so-called "official" part of their career ended, to me, were those who had taught. Teaching enriches and enlivens one's work.

For spiritual companions I have had the many artists who have relied on nature to help shape their imagination. And their most elaborate equipment was a deep reverence for the world through which they passed. Photographers share something with these artists. We seek only to see and to describe with our own voices, and, though we are seldom heard as soloists, we cannot photograph the world in any other way.

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 was a consultant for Kodak back in the late 80's. There were engineers there who told me that in the future, most photographs would be taken on telephones. They weren't able to do anything with that. They were engineers, not management.

My Dad took a workshop from a photographer who worked at the Toledo Blade, a newspaper I delivered. I knew this photographer's work. My Dad took a night class from him at the University of Toledo. Without that class, I wouldn't have become a photographer, because my Dad came home and taught me what he learned in class.

Though Geographic didn't publish that photo in the story that it was done for, "The Life of Charlie Russell," a cowboy artist in Montana. But later, maybe a year and a half ago, they named it one of the 50 greatest pictures ever made at National Geographic.