Ed Viesturs (born June 22, 1959) is one of the world's premier high-altitude mountaineers. He is the first American, and 12th person overall, to summit all fourteen mountains over 8000 meters (collectively known as the eight-thousanders), and the sixth climber to do it without bottled oxygen. Viesturs also has summitted Mount Everest six times, a feat that, excluding Sherpas, has only been surpassed by Pete Athans (7), Gheorghe Dijmarescu (8), and Dave Hahn (7). Wikipedia
The definitive Wikipedia entry for Ed Viesturs. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Ed_Viesturs
With his successful ascent of Annapurna on May 12, Ed Viesturs becomes the first North American to reach the top of all 14 8,000 meter peaks without supplemental oxygen. www.greatoutdoors.com/viesturs/