Prof. P.T. Johnstone

Title: Professor of the Foundations of Mathematics College: St John's College Email: P.T.Johnstone@dpmms Room: C1.07 Tel: +44 1223 3 37985 Lookup Prof. P.T. Johnstone in university directory Research Interests: I have been involved in the development of elemntary topos theory since its infancy in the early 1970s, and have written two books on the subject: "Topos Theory" (Academic Press, 1977) and "Sketches of an Elephant: a Topos Theory Compendium" (Oxford U.P., 2002). My interests focus particularly on the way in which topos theory provides a means of integrating geometric and logical ideas in the foundations of mathematics and of theoretical computer science.