Writer and ecological historian STEPHEN PYNE. His latest book, Fire on the Rim, A Firefighter's Season at the Grand Canyon, explores the intricacies of fire management, man's relation to the rural western environment, and the summer ritual that changes the canyon and the people who try to protect it. Pyne worked as a firefighter for 15 season's on the northern rim of the Grand Canyon. Pyne describes a life where the firefighter lives in isolation for four months, defined by the fires and the capriciousness of lightning.