John Hamilton Reynolds[2] (April 3, 1923 – November 4, 2000) was an American physicist and a specialist in mass spectrometry.
[3] John H. Reynolds was born (1923-04-03)April 3, 1923 in Cambridge, Massachusetts, United States.
There, he was influenced by his Ph.D. thesis advisor Mark Inghram and by two other famous physicists, Harold Urey and Enrico Fermi.
He specialized in mass spectrometry and utilized this method to determine isotope ratios needed for the radiometric dating of geologically and cosmologically relevant samples.
[7] He was helped by a new all-glass spectrometer that he had designed, which allowed gas samples to be run through it multiple times, helping to increase the odds of detection and alleviate the low sensitivity problems plaguing earlier attempts by other researchers on other meteorites.