Michael McKenna is the Keith Lehrer Chair and Professor of Philosophy in the Department of Philosophy at the University of Arizona. He is the author of Conversation and Responsibility (2012) and numerous articles on the topics of free will and moral responsibility.

Derk Pereboom is Stanford H. Taylor ’50 Chair and Susan Linn Sage Professor in the Philosophy Department at Cornell University. He is the author of Living without Free Will (2001), Consciousness and the Prospects of Physicalism (2011), Free Will, Agency, and Meaning in Life (2014), and articles on free will and moral responsibility, philosophy of mind, and the history of modern philosophy.