University of Southampton. Hyperbolic geometry, mostly in dimensions 2 and 3, and its connections to other areas, such as the geometry and topology of 3-manifolds and Riemann surfaces. Preprints and teaching material.

Rheinische Friedrich-Wilhelms-Universität Bonn. Differential geometry; geometric topology.

Brown University. Geometry, visualisation; Popularisation.

Geometric group theory. Includes a problem list.

Specializes in topology and classical geometry. Department of mathematics. California Institute of Technology.

Director of Graduate Studies, Department of Mathematics, Princeton University. Subjects: geometric analysis, algebraic geometry, differential geometry.

Finite geometry. Department of Mathematics. University of Colorado at Denver.

University of Houston Downtown. Computational geometry - Graffiti. Publications and software.

Manchester. Differential geometry, stochastic geometry and applications.

Caltech. 3-dimensional topology, geometry, and related topics.

Eastern Illinois University and University of Illinois at Urbana-Champaign. Differential Geometry and its Applications to Mathematical Physics; Index Theory and Foliations; Holomorphic Vector Bundles; Noncommutative Geometry. Books, articles and preprints.

University of Pittsburgh. Kepler conjecture (announced a computer-aided proof), other space tiling conjectures, Langlands theory.

University of Utah. Low-dimensional geometry and topology.

Triangle centers, integer sequences, mathematical history and biography.

Differential geometry, mathematical visualisation.