Timothy Williamson was born in Uppsala, Sweden. He has been the Wykeham Professor of Logic at Oxford University since 2000. Before that he was Professor of Logic and Metaphysics at Edinburgh University, and also taught at Trinity College Dublin. He has held visiting positions in philosophy at MIT, Princeton, Michigan, Yale (from 2016), Australian National University, Chinese University of Hong Kong, National Autonomous University of Mexico, and elsewhere. His books include Identity and Discrimination, Vagueness, Knowledge and its Limits, The Philosophy of Philosophy, and Modal Logic as Metaphysics. He is a Fellow of the British Academy, Foreign Honorary Member of the American Academy of Arts and Sciences, and Member of the Academia Europaea.