Marmet was part of the first two-man Swiss team which climbed Mount Everest in 1956.
(Prior to this, only Sir Edmund Hillary and Tenzing Norgay had successfully climbed the mountain in 1953[1]).
Marmet and his climbing partner, Ernst Schmied, became the third and fourth people (and the second two-man team) to reach Mount Everest's summit on 23 May 1956.
[1] Marmet and Schmied narrowly beat the next Swiss team to the top: The next day, the next two-man Swiss expedition of Hansruedi von Gunten and Dölf Reist reached the top of the mountain on 24 May 1956.
[2] Jürg Marmet died in Allschwil, Switzerland, on 8 March 2013, at the age of 85.