Ashay Dharwadker: Algebra, topology, graph theory and theoretical computer science.
Bela Bollobas: Functional analysis, combinatorics and graph theory.
Binh Minh Bui Xuan: Graph theory, graph algorithms and computation.
Dan Archdeacon: Topological graph theory, combinatorics, theoretical computer science.
David Eppstein: Graph algorithms and computational geometry.
David Penman: Random graphs, computational combinatorics.
Erdos Number Project: List of people with Erdos number at most 2.
Fabien de Montgolfier: Modular decomposition, graph theory and algorithms.
Gary Chartrand: Graph structures, distance in graphs and domination.
Gordon Royle: Algebraic graph theory.
Graph Theory White Pages: Directory of graph theorists maintained by Daniel P. Sanders.
Hubert de Fraysseix: Topological graph theory and combinatorics.
Julien Moncel: Identifying codes in graphs, combinatorics, graph theory and computer science.
Keith Edwards: Harmonious colourings and achromatic number.
Rich Lundgren: Applied graph theory and combinatorial matrix theory.
Stephen C. Locke: Graph theory and algorithms.
Tom Whaley: Formal development of programs, Steinhaus graphs, parallel computing.