Harold Urey was an American physical chemist who won the Nobel Prize in Chemistry in 1934 for his discovery of deuterium, a stable isotope of hydrogen. Born on April 29, 1893, Urey made significant contributions to various fields, including isotopic chemistry and the study of the origin of elements. He was also instrumental in developing the field of mass spectrometry.
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Harold Urey identified deuterium through the spectrum of a hydrogen sample enriched by low-temperature distillation. Ordinary hydrogen and deuterium have the same atomic number but different atomic mass; the small spectral displacement offered a way to recognize the heavier isotope.[ref]
https://www.nist.gov/history/nbsnist-culture-excellence/harold-c-urey-ferdinand-g-brickwedde-and-discovery-deuterium. NIST historical account of the 1931 spectroscopic identification and enriched hydrogen sample
Portrait of Harold Urey
. Portrait from NASA History, photographer not stated on the Commons file page. The file page identifies it as public-domain NASA material. Source.