I was just reading Airplane Stability and Control from Abzug and Larrabee and it has a list of bios for famous SnC engineers, here is what Harper's reads:
Harper, Robert P., Jr. 1926–, b. Gallipolis, OH. S.B. Ae. (1952), S.M.Ae. (1953), Mass. Inst. of Tech. Harper was a Calspan engineer and test pilot who is noted for his part in developing the Cooper-Harper flying qualities rating. He was project engineer on the F-94 and NT-33A variable-stability airplanes during simulation of reentry vehicles and the X-15, as well as during basic flying qualities research.