Spencer Johnston is Lecturer in Philosophy at the University of Cambridge. He has published a number of papers in journals including History and Philosophy of Logic, British Journal for the History of Philosophy, and Logic and Logical Philosophy. Henrik Lagerlund is Professor of Philosophy at Stockholm University. His books include Modal Syllogistics in the Middle Ages (2000), Rethinking the History of Skepticism (2010), Routledge Companion to the Sixteenth Century (2017), Skepticism in Philosophy: A Historical Introduction (2020), and Reconsidering Causal Powers: Historical and Conceptual Perspectives (2021).