Thomas Taylor Neill (1903-1988) was an aeropropulsion engineer and author. Following the completion of his degrees at Catholic University of America (BS.ME 1925) and the Massachusetts Institute of Technology (MS 1926) he went to work in the Aircraft Engine Research lab at the United States National Bureau of Standard (engineer 1926-39). He served as an ignition engineer for the Army Air Corps in Dayton, OH (1939-42). He then spent nearly twenty years in research for the National Advisory Committee for Aeronautics (Assistant to the Director of Research 1942-58) and its successor the National Aeronautics and Administration (NASA; Chief of Research Administration Division, Office of Advanced Research Programs 1958-61; Chief of Research and Technical Reports, Office of Advance Research and Technology, 1961-70). Following his retirement from NASA, Neill worked as a consultant to the National Air and Space Museum (1971- ) where he began compiling a book on aviation engines in the inter-war period.