Mountain Madness interests. While leading Mountain Madness, Fischer became renowned for his ascents of the world's highest mountains made without the use of supplemental oxygen. Fischer and Wally Berg were the first Americans to summit Lhotse, the world's fourth highest mountain (27,940 feet / 8516 m), located next to Mount Everest. He and Ed Viesturs were the first Americans to summit K2, (28,251 feet / 8611m) in the Karakoram of Pakistan without supplemental oxygen. During his stewardship of Mountain Madness, Fischer led social and environmental initiatives to help people in the countries in which Mountain Madness traveled. As the leaders of the
1939 American Karakoram expedition to K2 1939 American Karakoram expedition to K2 The unsuccessful 1939 American Karakoram expedition to K2 was the second U.S. attempt on the second-highest mountain in the world, following the 1938 reconnaissance expedition. Fritz Wiessner, the leader of the expedition, and Pasang Dawa Lama got to within of the summit of K2 via the Abruzzi Ridge – a difficult and arduous route – with Wiessner doing practically all the lead climbing. Through a series of mishaps one of the team members, Dudley Wolfe, was left stranded near the top of the mountain after his companions had descended to base camp. Three attempts