Although Fischer had decided in the early 1970s that he would one day have a guide service named Mountain Madness, the founders did not incorporate the company until 1984.

He 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.

As the leaders of the 1994 Sagarmatha Environmental Expedition, Fischer and Rob Hess both summited Mount Everest without supplemental oxygen.

[6] In 1997, the year after Scott Fischer's death, Keith and Christine Boskoff purchased Mountain Madness.

Mountain Madness continues to operate as a well-known and respected international adventure travel company.