Michael Ruse is one of the world's leading authorities on the history and philosophy of Darwinian evolutionary theory. He is the author of many books; his most recent book with Cambridge University Press is The Cambridge Companion to the Philosophy of Biology (2007, with David L. Hull). A Fellow of the Royal Society of Canada and of the American Association for the Advancement of Science, he has been a Herbert Spencer Lecturer at Oxford University and a Gifford Lecturer at Glasgow University, and he has also held Guggenheim and Isaak Walton Killiam fellowships.