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

There are a lot of ways to talk about the life of a photograph. You can talk about the afterlife of a photograph, and in the end I talk about that, with the Richard Prince picture. But mainly, what I dedicated the book to being about was how photographs begin their life, and where they begin it. And they begin it with the photographer's imagination and instinct and experience.

It's more difficult now, to be a Geographic photographer, than it was when I came along. And it wasn't easy at that time.

My parents, grandmother and brother were teachers. My mother taught Latin and French and was the school librarian. My father taught geography and a popular class called Family Living, the precursor to Sociology, which he eventually taught. My grandmother was a beloved one-room school teacher at Knob School, near Sonora in Larue County, Ky.

I was asked by a student what my most significant accomplishment was at National Geographic, after thirty years, and I said that my career came to an appropriate close, and I still loved photography. Not everybody who spends their career at anything ends up fascinated and involved with it.

Life rarely presents fully finished photographs. An image evolves, often from a single strand of visual interest - a distant horizon, a moment of light, a held expression.

But there is more to a fine photograph than information. We are also seeking to present an image that arouses the curiosity of the viewer or that, best of all, provokes the viewer to think-to ask a question or simply to gaze in thoughtful wonder. We know that photographs inform people. We also know that photographs move people. The photograph that does both is the one we want to see and make. It is the kind of picture that makes you want to pick up your own camera again and go to work.