 In 1962 he began a teaching position at the University of Washington, during which time he did fieldwork among the Shuswap in British Columbia, though fieldwork with Oklahoma Cherokee and Muskogee (Creek) continued through the 1960s.In 1965 he moved to the University of Chicago, where he continued to teach in the Department of Anthropology until his death.He also testified extensively before congressional committees on federal recognition of Indian tribes such as the Lumbee.