Daniel Kubert

Daniel Sion Kubert (/ˈkjuːbərt/; October 18, 1947¹ – January 5, 2010²) was an American mathematician who introduced modular units and Kubert 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.¹³ He received his Ph.D. in mathematics from Harvard University in 1973,⁴ where his dissertation "Universal Bounds on the Torsion and Isogenies of Elliptic Curves" was supervised by Barry Mazur.

Kubert served as a Gibbs Instructor at Yale University from 1973 to 1975.¹ His work on modular units was done in collaboration with Yale mathematician Serge Lang. Kubert was hired as an assistant professor at Cornell University in 1975,¹ and was still there at the end of the decade.⁵ By the early 1980s, Kubert was at the University of Pennsylvania.⁶ He also had two stints at the Institute for Advanced Study, in 1979–80 and 1984–85.⁴

In later life, Kubert was a resident of Philadelphia.²

• Kubert, Daniel S.; Lang, Serge (1981), Modular units, Grundlehren der Mathematischen Wissenschaften [Fundamental Principles of Mathematical Science], vol. 244, Berlin, New York: Springer-Verlag, ISBN 978-0-387-90517-4, MR 0648603, Zbl 0492.12002
• Kubert, Dan; Lang, Serge (1975), "Units in the modular function field. I", Mathematische Annalen, 218 (1): 67–96, doi:10.1007/BF01350068, ISSN 0025-5831, MR 0437496, S2CID 177788984, Zbl 0311.14005