Edmund Hillary
Sir Edmund Percival Hillary (20 July 1919 – 11 January 2008) was a New Zealand mountaineer, explorer, and philanthropist. On 29 May 1953, Hillary and Nepalese Sherpa mountaineer Tenzing Norgay became the first climbers confirmed to have reached the summit of Mount Everest. They were part of the ninth British expedition to Everest, led by John Hunt.
Reinhold Messner
On 8 May 1978, Reinhold Messner stood with Peter Habeler on the summit of Mount Everest; the first men known to climb Everest without the use of supplemental oxygen. Prior to this ascent it was disputed whether this was possible at all. Messner and Habeler were members of an expedition led by Wolfgang Nairz along the southeast ridge to the summit. Also on this expedition was Reinhard Karl, the first German to reach the summit, albeit with the aid of supplemental oxygen.