Gerard M. Faeth (1961 M.S., 1964 Ph.D., Mechanical Engineering), principal investigator for numerous combustion experiments on Space Shuttle missions, author of over 230 journal papers and 200 conference papers, and presenter of over 200 invited lectures.[197] Guion Bluford (1964, Aerospace Engineering), USAF Colonel, former NASA astronaut, and the first African American in space. Harold W. Gehman, Jr. (1965, Industrial Engineering) served as commander-in-chief of the U.S. Joint Forces Command and NATO Supreme Allied Commander, Atlantic until he retired in 2000.