 As a well-known leader in several national medical organizations and university associations, Marston was elected leader of the National Association of State Universities and Land Grant Colleges, an Association of American Medical Colleges Distinguished Service Member, and a member of the board of governors of the Institute of Medicine.He was also appointed to the corporate boards of the Hospital Corporation of America, Johnson & Johnson, and Wackenhut.Marston is prominently remembered for his role in desegregating the University of Mississippi medical school, his stewardship of the National Institutes of Health, and his advancement of the academic reputation and standing of the University of Florida.