Dr. Edgar L. Hewett	November 1915 - April 1929
Wesley Bradfield, Associate Director	?
Dr. Lyman Bryson, Associate Director	May 1, 1928 - April 1929
Dr. Clinton Abbott	1929
Malcolm J. Rogers, Acting Director	1933 - 1935
Malcolm J. Rogers	1935 - 1936
Dr. Edward L. Hardy	1936 - 1942?
Malcolm Farmer	1946 - 1950
Dr. Spencer L. Rogers	1971 - 1972
General Lowell English	1972 - 1981
--with Dr. Rogers as Scientific Director
--with Barton Wright as Scientific Director	1978 - 1982
Dr. Douglas Sharon	1981 - present