Alexander R. Pruss (PhD University of Pittsburgh) is Professor of Philosophy and Director of Graduate Studies at Baylor University. He is the author of several works, including The Principle of Sufficient Reason: A Reassessment (Cambridge University Press, 2006), One Body: An Essay in Christian Sexual Ethics (University of Notre Dame Press, 2012), and Infinity, Causation and Paradox (Oxford University Press, 2018).