Research Interests: Combinatorial, Assymptotic, and Geometric Group Theory;
Theory of Invariant Means; Abstract Harmonic Analysis; Noncommutative Ergodic
Theory; Low Dimensional Topology; Bounded Cohomology; L^2 Cohomology; Theory
of Random Walks; Spectral Theory of Discrete Laplace Operator on Groups and
Graphs; Automata and Formal Languages.