Dallas Willard (1935-2013) was a Professor of Philosophy at the University of Southern California from 1965 to 2012. A specialist in the philosophy of Edmund Husserl, his publications include Logic and the Objectivity of Knowledge: a Study in Husserl's Philosophy as well as numerous articles on Husserl as well as in ethics, epistemology, and the philosophy of religion. He also published the first English translations of Husserl's Philosophy of Arithmetic, his Early Writings in the Philosophy of Logic and Mathematics, and a number of shorter pieces by Husserl and other early phenomenologists.

Steven L. Porter is Professor of Theology and Philosophy at Biola University. He earned his Ph.D. in Philosophy from USC in 2003 under the direction of Dallas Willard. His previous publications include Restoring the Foundations of Epistemic Justification: A Direct Realist and Conceptualist Theory of Foundationalism and Neuroscience and the Soul: The Human Person in Philosophy, Science, and Theology.

Aaron Preston is Associate Professor of Philosophy at Valparaiso University. He earned his Ph.D. in Philosophy from USC in 2002 under the direction of Dallas Willard. His previous publications include Analytic Philosophy: the History of an Illusion, and Analytic Philosophy: an Interpretive History.

Gregg A. Ten Elshof is Professor of Philosophy at Biola University. He earned his Ph.D. in Philosophy from USC in 2000 under the direction of Dallas Willard. His previous publications include Introspection Vindicated, I Told Me So, and Confucius for Christians