People

Alan Frieze
Probabilistic combinatorics, theoretical computer science and operations research.
http://www.math.cmu.edu/~af1p/

Brendan McKay
Combinatorics, graph theory and related software.
http://cs.anu.edu.au/~bdm/

David Galvin
Graph theory, combinatorics and discrete probability.
http://www.math.upenn.edu/~dgalvin/

Doron Zeilberger
Combinatorics and automatic formal identities proving.
http://www.math.rutgers.edu/~zeilberg/

Erik Demaine
Combinatorics, theory of computation and algorithms.
http://theory.lcs.mit.edu/~edemaine/

Erlendur S. Thorsteinsson
Algorithms, combinatorics and optimization.
http://www.mmedia.is/esth/

Fan Chung Graham
Ramsey theory, spectral graph theory.
http://math.ucsd.edu/~fan/

Gilles Zemor
Combinatorics, coding theory, cryptography and additive number theory.
http://www.infres.enst.fr/~zemor/

Gregory Gutin
Graph theory and algorithms, combinatorial optimisation, linear and integer programming.
http://www.cs.rhbnc.ac.uk/home/gutin/

Herbert Wilf
Combinatorics and generating functions.
http://www.cis.upenn.edu/~wilf/

Janis Buls
Combinatorics on words, algebraic automata theory.
http://home.lanet.lv/%7ebuls/

Janos Pach
Combinatorial geometry.
http://www.math.nyu.edu/~pach/

Jaroslav Nesetril
Ramsey theory.
http://kam.mff.cuni.cz/~nesetril/

Jean-Sébastien Sereni
Graph theory, networks, combinatorics.
http://kam.mff.cuni.cz/~sereni/

Jean-Yves Thibon
Algebraic combinatorics and representation theory .
http://igm.univ-mlv.fr/~jyt/index_en.html

John P. Morgan
Statistics and experimental designs.
http://www.stat.vt.edu/facstaff/jpmorgan.html

Joshua Cooper
Combinatorial problems arising in number theory, algebraic geometry and coding theory.
http://cims.nyu.edu/~cooper/

Juergen Bierbrauer
Discrete mathematics and its interactions with geometry, cryptology and algorithms.
http://www.math.mtu.edu/~jbierbra/

Leonard H. Soicher
Design theory and combinatorial computing.
http://www.maths.qmul.ac.uk/~leonard/

Nantel Bergeron
Algebraic combinatorics.
http://www.math.yorku.ca/bergeron/

Neil James Alexander Sloane
Combinatorics, integer sequences, codes, sphere packings, graphs and lattices.
http://www.research.att.com/~njas/

Patrice Ossona de Mendez
Topological graph theory, combinatorics and pliant programming.
http://www.ehess.fr/centres/cams/person/pom/index.html

Peter Cameron
Permutation groups, and the finite or infinite structures on which they act.
http://www.maths.qmul.ac.uk/~pjc/

Propp, James
Combinatorics, game theory, probability theory and dynamical systems.
http://faculty.uml.edu/jpropp/

Quentin Stout
Discrete mathematics, statistics, algorithms and parallel computing.
http://www.eecs.umich.edu/~qstout/

Raul Banos
Optimization in complex problems and heuristics.
http://www.ual.es/~rbanos

Rosemary A. Bailey
Experimental designs and statistics.
http://www.maths.qmul.ac.uk/~rab/

Said Amghibech
Spectral graph theory and algorithms.
http://geocities.com/said_amghibech/

Sebastien Roch
Applied probability and theoretical computer science.
http://research.microsoft.com/users/seroch/

Ted Spence
Classification of combinatorial designs.
http://www.maths.gla.ac.uk/~es/

Tom Leighton
Algorithms for network applications and cryptography.
http://theory.csail.mit.edu/~ftl/

Vašek Chvátal
Hamiltonian cycles, perfect graphs and combinatorial optimization.
http://www.cs.concordia.ca/~chvatal/

Wesley Pegden
Combinatorics and graph theory.
http://people.cs.uchicago.edu/~wes