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I completed a PhD from the Department of Mathematics at The University of Texas at Austin in May 2009 and will be teaching at St. Edward's University beginning August 2009. My advisor was Alan Reid, and my thesis is entitled The Arithmetic and Geometry of Two-Generator Kleinian Groups.  My general research interest is the geometry and topology of 3-manifolds.  More specifically, I study the structure and properties of hyperbolic 3-manifold groups (particularly knot and link groups) and arithmetic Kleinian groups. Department of Mathematics The University of Texas at Austin 1 University Station C1200 Austin, TX 78712 Office: RLM 10.108 Email: callahan@math.utexas.edu