Jeffrey Ezra Hoffstein (born September 28, 1953 in New York City)[1] is an American mathematician, specializing in number theory, automorphic forms, and cryptography.

[4] His research uses analytic and algebraic methods to investigate L-series of automorphic forms over GL(n) and number fields.

With co-workers he has developed new techniques for Dirichlet series in several complex variables.

[5] At MSRI, in the academic year 1994/95 he initiated seminars on automorphic functions.

In 1996, Hoffstein, along with Jill Pipher, Joseph Silverman, and Daniel Liemann (Hoffstein's former doctoral student), founded NTRU Cryptosystems, Inc. to market their cryptographic algorithms, NTRUEncrypt and NTRUSign.