Robert J.
Zimmer\'s body of work is remarkable in that it involves methods from a variety of mathematical disciplines, such as Lie theory, differential geometry,.
Group Actions in Ergodic Theory, Geometry, and Topology: Selected Papers brings together some of the most significant writings by Zimmer, which lay out his program and contextualize his work over the course of his career.
Zimmer is best known in mathematics for the highly influential conjectures and program that bear his name.
Robert J