Robin Wilson is an Emeritus Professor of Pure Mathematics at the Open University, Emeritus Professor of Geometry at Gresham College, London, and a former Fellow of Keble College, Oxford. He is currently President of the British Society for the History of Mathematics. He has written and edited many books on graph theory, including Introduction to Graph Theory and Four Colours Suffice, and on the history of mathematics, including Lewis Carroll in Numberland. He is involved with the popularization and communication of mathematics and its history, and has been awarded prizes by the Mathematical Association of America for ‘outstanding expository writing’.