MARK TWIGHT is one of America's leading alpinists. His gripping accounts have been published around the world and translated into five languages. He is also the author of the best-selling book Extreme Alpinism: Climbing Light, High and Fast, from The Mountaineers Books. A trip leader for Joseph Van Os Photo Safaris, JAMES MARTIN has contributed to Outdoor Photographer magazine and has seventeen books to his credit. For the Planet Ice project, he has ventured to Antarctica, Greenland, Baffin Island, the Alaska Range, Mount Everest, Patagonia, Central Africa's Ruwenzori Mountains, Mount Kilimanjaro, the Alps, the Canadian Rockies, Glacier National Park in Montana, Ecuador's volcanoes, Washington State's Cascade Mountains, Alaska's North Slope, the Three Gorges in China's Yunnan Province, and Shishapangma, also in China. He is represented by Getty Images and ImageState. For more information on Martin and his newly released book with Braided River, please visit www.planeticebook.com or Planet Ice.