Jason John Nassau (1893–1965) was anAmericanastronomer.
He performed his doctoral studies at Syracuse, and gained hisPh.D.mathematics in 1920. (His thesis wasSome Theorems in Alternants.) He then became an assistant professor at the Case Institute of Technology in 1921, teachingastronomy. He continued to instruct at that institution, becoming the university's first chair of astronomy from 1924 until 1959 and chairman of the graduate division from 1936 until 1940. After 1959 he was professor emeritus.
From 1924 until 1959 he was also the director of theCase Western Reserve University (CWRU)Warner and Swasey Observatory inCleveland, Ohio. He was a pioneer in the study ofgalactic structure. He also discovered a new star cluster, co-discovered 2 novae in 1961, and developed a technique of studying the distribution of red (M-class or cooler) stars.
In 1922, Nassau led the formation of theCleveland Astronomical Society, "a club among those citizens of Cleveland and vicinity who were interested in astronomy."[1][2] He served as the extant organization's first president for 41 years.
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