Author, chemist, physician, scientist, and civil rights activist, he was a pioneer in the field of chemistry. Calloway was an organic chemist, physician, military officer, and educator. Immediately after getting his Ph.D., Calloway became head of the chemistry department at the
Tuskegee Institute in Alabama. Calloway was also a professor at the
University of Illinois Medical School and wrote more than 30 scientific articles and publications in scientific journals. He served as a medical director of
Provident Hospital in Chicago until 1949, and then founded the Medical Associates Clinic of Chicago. Later, Calloway became the chief of medical services for Veterans Administration Hospital in
Tomah, Wisconsin. In 1958, Calloway opened a group medical practice in Chicago. He became Chief of the Medical Staff at the Tomah Wisconsin Veterans Administration Hospital in 1963. He then opened a private practice in Madison in 1966. Calloway studied synthetic organic chemistry, a branch of chemistry that focuses on compounds that contain the element carbon. He also had a passion for writing Calloway published several peer-reviewed articles in top chemistry journals such as the Journal of the American Chemical Society. While still practicing medicine in Chicago in the 1950s, he built a 400-acre showplace in Wisconsin, the Grand Marsh Wildlife Ranch, where wild and domestic animals that were kept in large, natural habitats. He continued to volunteer his time with the Tuskegee Institute and with Iowa State until his death from cancer in 1979. ==
Shadow Doctor ==