Jeffrey Lagarias

Jeffrey Clark Lagarias (born November 16, 1949) is a mathematician and professor at the University of Michigan.

Education While in high school in 1966, Lagarias studied astronomy at the Summer Science Program.

He completed an S.B. and S.M. in Mathematics at the Massachusetts Institute of Technology in 1972. The title of his thesis was "Evaluation of certain character sums". He received his Ph.D. in Mathematics from MIT for his thesis "The 4-part of the class group of a quadratic field", in 1974. His advisor for both his masters and Ph.D. was Harold Stark.

He disproved Keller's conjecture in dimensions at least 10. Lagarias has also done work on the Collatz conjecture and Li's criterion and has written several highly cited papers in symbolic computation with Dave Bayer.

Awards and honors Lagarias received in 1986 a Lester R. Ford award from the Mathematical Association of America and again in 2007.

In 2012, he became a fellow of the American Mathematical Society.

In 2024 he was elected as a member of the National Academy of Sciences.