In 1969, Tom Wesaw was an 83-year-old Shoshone doctor and religious leader on the Wind River Reservation in Wyoming. He could no longer drive, which posed problems in making house calls. The arrival of young anthropologist Tom Johnson changed that. Johnson would drive Wesaw, and cook, pump water, and build fires for sweat lodges. In exchange, the elder Tom would show the younger Tom his work. The two were together so often that the people of Wind...