Rate My Professor Andrew Zimmer

Andrew Zimmer is an Associate Professor of Mathematics at the University of Wisconsin-Madison, a position he has held since 2023, following his appointment as Assistant Professor there from 2020 to 2023. He currently serves as Director of Undergraduate Studies and chairs the Undergraduate Program-Advanced and Early committees, as well as co-chairing Undergraduate Advising in the department. Previously, Zimmer held Assistant Professor positions at Louisiana State University from 2018 to 2020 and at the College of William and Mary from 2017 to 2018. He began his postdoctoral career as an L.E. Dickson Instructor at the University of Chicago from 2014 to 2017. Zimmer earned his Ph.D. in Mathematics from the University of Michigan in May 2014, advised by Ralf Spatzier; an M.S. in Mathematics from the University of Illinois at Urbana-Champaign in May 2010; and a B.S. in Mathematics and Computer Science from the University of Puget Sound in May 2008. He participated in the Budapest Semesters in Mathematics program in Fall 2006.

Zimmer's research accomplishments have been honored with the 2022 Alfred P. Sloan Research Fellowship, the 2020 NSF CAREER Grant, the 2014 NSF Postdoctoral Fellowship, a 2025 NSF Standard Research Grant, and roles as co-PI on NSF grants including a 2023 RTG grant and a 2023 conference grant. In 2026, he will serve as Research Professor at SLMath's semester program on Geometry and Dynamics for Discrete Subgroups of Higher Rank Lie Groups. His publications include "Rigidity of proper holomorphic maps between balls with Hölder boundary regularity" (2026, submitted, with K. Huang, J. Park, A. Skenderi, J. Srimurthy, R. Wen), "A rigidity theorem for complex Kleinian groups" (2025, submitted, with R. Canary, T. Zhang), "Weakly holomorphic homogeneous regular manifolds" (2026, Journal of Geometric Analysis), "Patterson–Sullivan measures for transverse subgroups" (2024, with R. Canary, T. Zhang), and "Bi-Lipschitz rigidity of discrete subgroups" (2024, submitted, with R. Canary, H. Oh). Zimmer has mentored postdocs such as Max Lahn and Feng Zhu, Ph.D. students including Vicky Wen and Aleksander Skenderi, and undergraduates via MXM Lab projects and REUs, with one REU project yielding a publication. He has organized workshops including the Midwest Summer School in Geometry, Topology, and Dynamics (2025), the Junior Workshop in SCV (2024), and conferences such as Gromov Hyperbolicity and Negative Curvature in Complex Analysis (2021). His teaching includes Math 421 (Theory of Single Variable Calculus), Math 765 (Differential Geometry), Math 823 (Advanced Topics in Complex Analysis), and Math 826 (Advanced Topics in Functional Analysis and Differential Equations).