Ed Viesturs-- National Geographic

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PHOENIX -- Men's Journal calls him "the ultimate climbing machine." Ed Viesturs has been to the top of Mt. Everest seven times. He's also hit the peaks of 14 of the highest mountains in the world -- without supplemental oxygen. You might have seen him on National Geographic, or perhaps you've read his book, "K2 - Life and Death on the World's Most Dangerous Mountain."