I am a Professor in the Department of Mathematics at the CUNY Graduate Center.
My research is largely focused on where the study of discrete subgroups of Lie groups intersects with algebraic geometry, low-dimensional topology, hyperbolic geometry, dynamics, and number theory. In some sense, the problems I study follow up on the work of Klein, Picard, and Poincaré, but from a more modern point of view it is deeply influenced by the Gromov-Thurston perspective on geometry and topology and the work of Margulis on dynamics and rigidity.
I graduated from the Maine School of Science and Mathematics in 1999 and the University of Chicago in 2003 with a BA in mathematics. My PhD is from the Department of Mathematics at the University of Texas at Austin in 2010, where my advisor was Alan W. Reid. I was an RTG Postdoctoral Assistant Professor at the University of Michigan from 2010 to 2013 and was at Temple University from 2013 to 2026.
My work was awarded a 2023 Temple Dean’s Distinguished Excellence in Research Award, and is currently supported by NSF grant DMS-2506896, along with award SFI-MPS-TSM-00014184 from the Simons Foundation. My paper Arithmeticity, superrigidity, and totally geodesic submanifolds with Uri Bader, David Fisher, and Nicholas Miller was awarded a 2026 Frontiers of Science award.