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George Herbert Leigh Mallory (18 June 1886 – 8 or 9 June 1924) was an English mountaineer who took part in the first three British expeditions to Mount Everest in the early 1920s.

During the 1924 British Mount Everest expedition, Mallory and his climbing partner Andrew "Sandy" Irvine both disappeared on the North-East ridge during their attempt to make the first ascent of the world's highest mountain. The pair were last seen when they were about 800 vertical feet (245m) from the summit.

Mallory's ultimate fate was unknown for 75 years, until his body was discovered on 1 May 1999 by an expedition that had set out to search for the climbers' remains. Whether Mallory and Irvine reached the summit of Everest before they died remains a subject of speculation and continuing research.