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
Geography of Gilgit–Baltistan world's highest mountain ranges. The main ranges are the Karakoram and the western Himalayas. The Pamir mountains are to the north and the Hindu Kush lies to the west. Amongst the highest mountains are K2 (Mount Godwin-Austen) and Nanga Parbat, one of the most feared mountains in the world. Many of the highest peaks in Gilgit-Baltistan, such as Baltoro Muztagh, K2 (Mount Godwin-Austen) (8,611 m), the second-highest mountain in the world), the Gasherbrums (7,932 - 8,080 meters, ranked 12-17 in the world), and Masherbrum (7,821 m), 22nd-highest in the world), lie in the Skardu District. Other high peaks are Distaghil