Chaitin, Gregory - Complexity theory and information theory. - http://www.umcs.maine.edu/~chaitin/
Cigler, Johann, Dr. - Professor of Mathematics at the University of Vienna. Contact information and departmental information. - http://radon.mat.univie.ac.at/People/JohannCigler.html
Cullinane, Steven H. - A systems analyst/programmer with an interest in combinatorics, permutation groups, and philosophy with some very good links to those areas. Personal information including a web journal. - http://www.m759.com/
Cohn, Henry - Researcher in the Theory Group of Microsoft Research. His primary research interests are number theory, combinatorics, and theoretical computer science. Contact information and a nicely organized listing of eprints of his papers. - http://research.microsoft.com/~cohn/
Cao, Wenwu - Joint research appointment to Department of Mathematics and Materials Research Institute at Pennsylvania State University. His research involves domain pattern formation and domain switching in ferroelectric materials. Full-text eprints of a number of his - http://www.math.psu.edu/cao/
Chang, Sun-Yung Alice - Department of Mathematics, Princeton University. Research interests include geometric analysis, algebraic geometry, differential geometry. Recent preprints, course lecture-notes, list of publications, - http://www.math.princeton.edu/~chang