Jack Sempliner

Email: [first initial][last name][at]math.ucla.edu

About

As of 2025 I am a Hedrick adjunct assistant professor at the University of California, Los Angeles. Before that from 2021-2024 I was a postdoc at Imperial College London where I was supported by the ERC grant of Toby Gee. Before (and indeed during) that I was a graduate student at Princeton University, where I was a PhD student of Richard Taylor. While at Princeton I was supported by the National Science Foundation under the NSF Graduate Research Fellowship Program.

Together with Peter Xu I am organizing the UCLA Number Theory Seminar during the calendar year 2025-2026. If you would like to come give a talk, please feel free to get in touch.

I work in number theory and arithmetic geometry. Specifically I have a focus on the geometry of Shimura varieties and moduli stacks of shtuka with applications towards the Langlands program. More recently I have been focusing on the p-adic geometry of Shimura varieties at infinite level, the geometry of Igusa stacks, and the geometry of the moduli stacks of Langlands parameters.