Scientists are usually nice, organized, logical people who are very cooperative. I always learn a lot of science while shooting science stories and it helps to be able to speak intelligently to a subject about his or her field of work, i.e., do your homework before the photography.

RAW is very forgiving. I was photographing a farm woman in Ecuador cooking over a small fire and my fill flash didn't go off a few times. I was about to delete the RAW files but decided to play with the curves first because I like the composition. It turned out that the image, although underexposed by two stops, was better than the fill-flashed images because the fire was the only source of illumination and it looked more real.

Having a partner who is your wife traveling with you can be great. We each have our roles in the work and then can help each other out on the emotional front when things get stressful, which they are.

To me a translator is very, very important. If the fixer is also the translator, so much the better. I have known photographers who didn't speak the language and would work in a place for weeks without one, getting by on common sense and smiles. But how many situations did they miss because they couldn't talk to someone and get the back story on details, small daily life things, etc.

As a senior in high school my counselor recommended that I soften my science and math direction with an art course. Fortunately my high school offered a new course in B&W photography, so I opted for that instead of art, towards which I had an aversion. Composition is something that comes pretty naturally to me and I appreciate ordered chaos: the photo class turned out to be fun.

It is so much better to get the right exposure than to have to mess around later with Photoshop.

Everyone thinks it would be great to work for National Geographic. So did I.