Ang Rita

Ang Rita Sherpa was a Nepali mountaineer who climbed Mount Everest ten times without the use of supplemental oxygen between 1983 and 1996. His sixth climb set the world record for the most successful ascents of Mount Everest, which he re-set on his tenth climb. Although others have since summitted Everest more, he still holds the record for most summits without supplementary oxygen. He was also the first, and to date only, person to climb Mount Everest without supplementary oxygen in winter. He was nicknamed the "Snow Leopard" by his peers.