Scott Eugene Fischer was an American mountaineer and mountain guide. He was renowned for ascending the world's highest mountains without supplemental oxygen. Fischer and Wally Berg were the first Americans to summit Lhotse, the world's fourth highest peak. Fischer, Charley Mace, and Ed Viesturs summitted K2 without supplemental oxygen. Fischer first climbed Mount Everest in 1994 and later died during the 1996 blizzard on Everest while descending from the peak.

Edmund Viesturs is an American high-altitude mountaineer, corporate speaker, and well known author in the mountain climbing community. He was the first American climber to ascend all 14 of the eight-thousander mountains, and the 5th person to do so without supplemental oxygen. Along with Apa Sherpa, he has summitted eight-thousanders on 21 occasions, including Mount Everest seven times.