 In 1925, he made the first ascent without guides of the Brouillard Ridge on Mont Blanc.In 1929, he met mountaineer Eric Shipton and together they climbed the twin peaks of Mount Kenya, making the first ascent of Nelion, the secondary summit.A member of Hugh Ruttledge's 1933 Mount Everest expedition, Wyn-Harris reached Edward Norton's record height of 8,573 m (28,126 feet).