Daniel Sion Kubert (/ˈkjuːbərt/; October 18, 1947[1] – January 5, 2010[2]) was an American mathematician who introducedmodular units andKubert identities.
He grew up in a secular Jewish family in Elkins Park, Pennsylvania, the son of David Kubert, an attorney, and Adele (Sion) Kubert, a high school teacher. Daniel graduated from Philadelphia's Central High School in 1965. Kubert graduated from Brown University in 1969, receiving B.S. and M.A. degrees in the same year.[1][3] He received his Ph.D. in mathematics fromHarvard University in 1973,[4] where his dissertation "Universal Bounds on the Torsion and Isogenies of Elliptic Curves" was supervised byBarry Mazur.
Kubert served as a Gibbs Instructor atYale University from 1973 to 1975.[1] His work on modular units was done in collaboration with Yale mathematicianSerge Lang. Kubert was hired as an assistant professor atCornell University in 1975,[1] and was still there at the end of the decade.[5] By the early 1980s, Kubert was at theUniversity of Pennsylvania.[6] He also had two stints at theInstitute for Advanced Study, in 1979–80 and 1984–85.[4]
In later life, Kubert was a resident of Philadelphia.[2]
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