 From there Dr. Lewis was tenured at the University of Wisconsin–Milwaukee, Arizona State University, and at the Saskatchewan Indian Federated College as Dean.Additionally, Dr. Lewis has guest lectured across the country at universities for 30 years.Beyond the academic world, Dr. Lewis was a psychiatric social worker who developed mental health programs for American Indians at the Tahlequah and Claremore Indian Hospitals in Oklahoma and later for the state of Oklahoma.