Robin J. WilsonRobin J. Wilson is Emeritus Professor of Pure Mathematics at the Open University, UK, and Emeritus Professor of Geometry at Gresham College, London. After graduating from Oxford, he received his PhD in number theory from the University of Pennsylvani. He has written and co-edited many books on graph theory and the history of mathematics, including Introduction to Graph Theory, Four Colors Suffice and Combinatorics: Ancient and Modern. His combinatorial research interests formerly included graph colourings and now focus on the history of combinatorics. An enthusiastic populariser of mathematics, he has won two awards for his expository writing from the Mathematical Association of America. Read More Read Less