Neal Hooker Williams (1870–1956) was a physicist notable for the very first spectroscopic measurements at microwave frequencies. He carried this out with a magnetron and investigated the spectrum of gaseous ammonia together with his student Claud E. Cleeton. This formed the groundwork for the later inventions of the radar and the gas laser.

He completed his PhD in 1912 at the University of Michigan with a thesis entitled The Stability of Residual Magnetism. ^[1]

• Walter S. Huxford and Neal H. Williams, Determination of the Charge of Positive Thermions from Measurements of the Shot Effect, Minneapolis, Minn., 1929.
• Claud E. Cleeton and Neal H. Williams, Electromagnetic Waves of 1.1 cm Wave-Length and the Absorption Spectrum of Ammonia, Lancaster, Pa., Lancaster press, inc., 1934.
• Harrison M. Randall, Neal H. Williams, and Walter F. Colby, General College Physics, New York, London, Harper & brothers, 1929.
• Neal H. Williams, The Stability of Residual Magnetism, New York, 1913.

• Trigonal pyramidal molecular geometry
• Ammonia
• Microwave spectroscopy
• Claud E. Cleeton

• Mario Bertolotti, The History of the Laser CRC Press, 2004, ISBN 0-7503-0911-3.

• Williams' 1936 Physical Review paper
• Williams in classbook of 1928
• Williams' math genealogy