Henry Treise Morshead was an English surveyor, explorer and mountaineer. He is remembered for several achievements – with Frederick Bailey he explored the Tsangpo Gorge and finally confirmed that the Yarlung Tsangpo flows into the Brahmaputra River after cascading through Himalaya; also he was a member of the 1921 and 1922 British Mount Everest expeditions and in 1922 he climbed to a height of over 25,000 feet (7,600 m). His death was due to murder and the circumstances remain mysterious.

Frederick Marshman Bailey was a British political officer and one of the last protagonists of The Great Game. His expeditions in Tibet and Assam Himalaya gave him many opportunities to pursue his hobbies of photography, butterfly collecting, and trophy hunting in the high Tibetan region. Over 2000 of his bird specimens were presented to the Natural History Museum, although his personal collection is now held in the American Museum of Natural History, New York. His papers and extensive photograph collections are held in the British Library, London.