Dr. Harris has celebrated 58 years as a faculty member in Schools of Medicine at Indiana U, U Missouri-Columbia, and U Louisville, with Visiting Professorships in Applied Science at the California Institute of Technology and in Food Science at the University of Maine.

Dr. Harris has started and operated 4 small businesses in agriculture, real estate, and medical technology development.  He has been an invited lecturer on creative financing of startup companies in the UofL Business school and has served on numerous Business, Hospital, Professional Society, and University Advisory Boards.  He is a past-President for the American Microcirculatory Society, and the International World Congress for Microcirculation.  He has served many years on research and program review committees for the US National Institutes of Health, the Canadian Medical Council, the American Heart Association, and is an appointed member of the Chinese Academy of Sciences.