Jenness then served as an ethnologist with the Canadian Arctic Expedition from 1913 to 1916 under the leadership of both Vilhjalmur Stefansson and Dr Rudolph M. Anderson. His detailed studies of the Copper Inuit, sometimes called the Blond Eskimos, around Coronation Gulf, and of other Arctic native people, helped establish him. Although most of his time thereafter was devoted to Indian studies (and administrative duties), he soon identified two very important prehistoric Eskimo cultures: the Dorset culture in Canada (in 1925) and the Old Bering Sea culture in Alaska (in 1926), for which he later was named "Father of Eskimo Archaeology."