Alexander Klein is Canada Research Chair and Associate Professor of Philosophy at McMaster University. He has held postdocs and fellowships at Cornell University, the University of Toronto, and the University of Sheffield, and his work has been supported by the Fulbright Foundation and the Andrew Mellon Foundation. Journals in which his essays appear include Philosopher’s Imprint, Journal of the History of Philosophy, and Philosophy of Science, and he is also the editor of the Oxford Handbook of William James.