Mathematics professor at Rutgers University in Newark. Researcher in Topology, Geometry, and Geometric Group Theory. Currently specializing in the large scale geometry of $Out(F_n)$, the outer automorphism group of a free group of finite rank $n$.
27 Connected sum of topological manifolds Feb 12 '13
20 Actions on Sⁿ with quotient Sⁿ Jul 25 '12
20 Conjugacy classes of $SL_2(Z)$ Apr 13
19 Periodic automorphisms of free groups Apr 25 '12
18 Manifolds with two coordinate charts Dec 28 '12
15 Was the early calculus inconsistent? Mar 20 '13