Past academics of the university include, Patricia Broadfoot, vice-chancellor of the University of Gloucestershire, Nigel Thrift, vice-chancellor of the University of Warwick, and Wendy Larner, provost of Victoria University of Wellington. Anthony Epstein, co-discoverer of the Epstein-Barr virus, was Professor of Pathology at the university from 1968 to 1982, Sir John Lennard-Jones, discoverer of the Lennard-Jones potential in physics and Alfred Marshall, one of the University College's principals and influential economist in the latter part of the 19th century. Mathematicians and philosophers Rohit Parikh and Brian Rotman lectured in the mathematics department, and philosophers of science Paul Feyerabend and Alexander Bird taught in the department of philosophy. Another notable current academic in the department of philosophy includes Havi Carel. Notable mathematicians who have worked in the department of mathematics include Hannes Leitgeb, Philip Welch, Ben Green, Andrew Booker, Julia Wolf, Jens Marklof, John McNamara, Howell Peregrine, Christopher Budd John Hogan, Jeremy Rickard, Richard Jozsa, Corinna Ulcigrai, David Evans and the statistician Harvey Goldstein.