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Banchoff, Tom - http://www.math.brown.edu/~banchoff/
Brown University. Geometry, visualisation; Popularisation.
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Sormani, Christina - http://comet.lehman.cuny.edu/sormani/
Lehman College and CUNY Graduate Center. Riemannian reometry: manifolds with Ricci curvature bounds, their Gromov-Hausdorff limits and metric spaces.
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Palais, Richard - http://rsp.math.brandeis.edu/
Differential geometry, mathematical visualisation.
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Hales, Thomas C. - http://www.math.pitt.edu/~thales/
University of Pittsburgh. Kepler conjecture (announced a computer-aided proof), other space tiling conjectures, Langlands theory.
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Dodson, C.T.J. (Kit) - http://www.maths.manchester.ac.uk/~kd/homepage/dodson.html
Manchester. Differential geometry, stochastic geometry and applications.
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Bestvina, Mladen - http://www.math.utah.edu/~bestvina/
Geometric group theory. Includes a problem list.
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Calegari, Danny - http://www.its.caltech.edu/~dannyc/
Specializes in topology and classical geometry. Department of mathematics. California Institute of Technology.
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Ballmann, Werner - http://www.math.uni-bonn.de/people/hwbllmnn/
Rheinische Friedrich-Wilhelms-Universität Bonn. Differential geometry; geometric topology.
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Kimberling, Clark - http://faculty.evansville.edu/ck6/
Triangle centers, integer sequences, mathematical history and biography.
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Chang, Sun-Yung Alice - http://www.math.princeton.edu/~chang
Director of Graduate Studies, Department of Mathematics, Princeton University. Subjects: geometric analysis, algebraic geometry, differential geometry.
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Kapovich, Michael - http://www.math.utah.edu/~kapovich/
University of Utah. Low-dimensional geometry and topology.
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Anderson, Jim - http://www.maths.soton.ac.uk/staff/Anderson/
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.
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Dunfield, Nathan - http://www.its.caltech.edu/~dunfield/
Caltech. 3-dimensional topology, geometry, and related topics.
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Glazebrook, James F. - http://www.math.uiuc.edu/~glazebro/
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.
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DeLaVina, Ermelinda - http://cms.dt.uh.edu/faculty/delavinae/
University of Houston Downtown. Computational geometry - Graffiti. Publications and software.
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Sullivan, John M. - http://www.math.uiuc.edu/~jms/
Optimal geometries.
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Cherowitzo, Bill - http://www-math.cudenver.edu/~wcherowi/
Finite geometry. Department of Mathematics. University of Colorado at Denver.
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