Ed Viesturs

Edmund "Ed" Viesturs is an American high-altitude mountaineer, corporate speaker, and well known author in the mountain climbing community. He was the first American to climb all 14 of the eight-thousander mountains, and the 5th person to do so without supplemental oxygen. In 2023, Guinness World Records reclassified the first person to summit the true summits of all 8000ers and awarded Viesturs the record of the first ascent of all 14 peaks. This claim has been disputed.