- The Tits Alternative for Out(F_n) I: Dynamics of exponentially growing
automorphisms with Mark Feighn and Michael Handel (Annals of Math.
**151**(2000), 517-623)

- The Tits Alternative for Out(F_n) II: A Kolchin Theorem with Mark Feighn and Michael Handel

- Solvable subgroups of Out(F_n) are virtually abelian with Mark Feighn and Michael Handel

- The topology at infinity of Out(F_n) with Mark Feighn (Invent.
Math.
**140**(3) (2000) pp 651-692). For an online copy of the published paper through Springer Link go here

- R-trees in topology, geometry, and group theory survey paper about real trees

- Non-positively
curved aspects of Artin groups of finite type Geometry and Topology
**3**(1999), 269-302

*Van Kampen's embedding obstruction for discrete groups*with Misha Kapovich and Bruce Kleiner (Invent. math.**150**(2002) 2, 219-235). For an online copy of the published paper through Springer Link go here

*Proper actions of lattices on contractible manifolds*with Mark Feighn (Invent. math.**150**(2002) 2, 237-256). For an online copy of the published paper through Springer Link go here

- Bounded
cohomology of subgroups of mapping class groups with Koji
Fujiwara, Geometry and Topology
**6**(2002), 69-89

- The topology of Out(F_n) survey paper about Out(F_n). There are also slides from a talk I gave

- Notes on Sela's work: Limit groups and Makanin-Razborov diagrams with Mark Feighn

- Counting maps from a surface to a graph with Mark Feighn

- Limit groups are CAT(0) with Emina Alibegovic

- Dimension of the Torelli group for Out(F_n) with Kai-Uwe Bux and Dan Margalit

- Quasi-homomorphisms on mapping class groups with Koji Fujiwara

- A characterization of higher rank symmetric spaces via bounded cohomology with Koji Fujiwara

- The asymptotic geometry of right-angled Artin groups, I with Bruce Kleiner and Michah Sageev

- The Dimension of the Torelli group with Kai-Uwe Bux and Dan Margalit

- Quasiflats in CAT(0) complexes with Bruce Kleiner and Michah Sageev

- A hyperbolic Out(F_n)-complex with Mark Feighn

- Shearing coordinates and convexity of length functions on Teichmueller space with Ken Bromberg, Koji Fujiwara and Juan Souto

- Some groups of mapping classes not realized by diffeomorphisms with Tom Church and Juan Souto

- Asymmetry of Outer space with Yael Algom-Kfir

- The asymptotic dimension of mapping class groups is finite with Ken Bromberg and Koji Fujiwara

- Geometry of Integral Binary Hermitian Forms with Gordan Savin

- Filling boundaries of coarse manifolds in semisimple and solvable arithmetic groups with Alex Eskin and Kevin Wortman

- Hyperbolicity of the complex of free factors with Mark Feighn