Gillenwater (born July 27, 1933 in Kingsport) is professor emeritus at the University of Virginia.
He is former chair of the Department of Urology at the School of Medicine of the University of Virginia, was president of the American Urological Association, editor of the Journal of Urology, member of the NIH Advisory Council of Diabetes, Digestive, and Kidney Diseases, and president of the American Foundation for Urologic Diseases.