Matt T. Clay  Department of Mathematics University of Oklahoma Office: PHSC 1024 Phone: 405-325-0793 e-mail: mclay "at" math.ou.edu   Teaching Running OU Seminars: Geometric Group Theory Seminar Geometry and Topology Seminar Papers and Preprints: Morse theory and conjugacy classes of finite subgroups with Noel Brady and Pallavi Dani .pdf .ps (to appear in Geometriae Dedicata) On the isomorphism problem for generalized Baumslag-Solitar groups with Max Forester .pdf .ps Whitehead moves for G-trees with Max Forester .pdf .ps Deformation spaces of G-trees and automorphisms of Baumslag-Solitar groups .pdf .ps (to appear in Groups, Geometry and Dynamics) A fixed point theorem for deformation spaces of G-trees .pdf .ps Comm. Math. Helv. 82 (2007), 237-246. (an early version appeared as "A generalization of Culler's Theorem") Contractibility of deformation spaces of G-trees .pdf .ps Alg. and Geom. Topol. 5 (2005), 1481-1503.