Brigadier Sir Edward Oliver Wheeler
Oliver Wheeler, a Canadian, was chosen to work with Morshead on the 1921 expedition for his expertise in the field of photo surveying. With Bullock and Mallory, Wheeler made the first ascent to the North Col and identified the East Rongbuk Glacier as the key approach to the col.
Born in Ottawa, Wheeler was a competent mountaineer, having accompanied his father (also a surveyor) on climbs in the Rockies. After serving in France, Mesopotamia, and India in World War I, he joined the Survey of India in 1919. From 1941 to 1943 he was Surveyor General of India.