Academic conferences, colloquia, and workshops
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"The Epistemology of Microphysics," invited presentation at the 49th Annual Meeting of the American Maritain Association, and receipt of AMA Scholarly Excellence Award, Loyola Marymount University, Los Angeles, CA (March 21, 2026)
"Aristotle on Education," invited presentation at the First Adeodatus Conference on Catholic Education and Culture, Pasadena, CA (June 21-24, 2023)
"Truth as a Transcendental," invited presentation at Tenth Annual Aquinas Philosophy Workshop on the theme Aquinas on Knowledge, Truth, and Wisdom, St. Mary's Campus, Greenville, SC (June 23-27, 2021)
Invited presentation of the Aquinas Lecture at Notre Dame Seminary, New Orleans (March 6, 2020)
Invited participation at conference on Science, Common Sense, and Prudence at Arizona State University (December 5 - 7, 2019)
Author Meets Critics session on Aristotle's Revenge at the American Catholic Philosophical Association meeting in Minneapolis, MN (November 23, 2019)
Invited presentation on the philosophy of nature at the Elmbrook Center, Cambridge, MA (October 5, 2019)
"The Immateriality of the Mind," invited talk sponsored by the Abigail Adams Institute, Harvard University (October 4, 2019)
Invited participation in colloquium on Christianity and modern paganism hosted by First Things and the Berkeley Institute, Berkeley, CA (July 22, 2019)
"The Metaphysics of the Will," invited lecture at the Ninth Annual Philosophy Workshop on the theme Aquinas on Human Action and Virtue, Mount Saint Mary College, Newburgh, NY (June 19 - 23, 2019)
Invited presentation of the Center for Thomistic Studies' 2019 Aquinas Lecture at the University of St. Thomas in Houston, and receipt of Order of St. Thomas medal (January 31, 2019)
Invited lectures on "Classical Theism and the Nature of God" and "Cooperation with Sins against Prudence and Chastity," Blackfriars Hall, University of Oxford (January 16 - 17, 2019)
Invited participation in Peoria Project seminar on Science and Common Sense, Redondo Beach, CA (December 6 - 8, 2018)
"The Immateriality of the Intellect," invited lecture at conference on The Spiritual Soul and Contemporary Neuroscience, Pontifical University of St. Thomas Aquinas (Angelicum), Rome (December 1, 2018)
Invited lecture on classical theism at Saint Charles Borromeo Seminary, Philadelphia, PA (November 12, 2018)
Invited participation in colloquium on Christianity and the intellectual life hosted by First Things and the Berkeley Institute, Berkeley, CA (July 30, 2018)
"What is a Law of Nature?" invited lecture at Fermilab, Chicago, IL (June 27, 2018)
"The Immateriality of the Mind," invited lecture at Society of Catholic Scientists conference at Catholic University of America, Washington, D.C. (June 9, 2018)
Invited lecture on classical theism at Southern Evangelical Seminary, Charlotte, NC (April 19, 2018)
"Cooperation with Sins Against Prudence," invited lecture at conference on Cooperation with Evil at the Dominican House of Studies, Washington, D.C. (March 17, 2018)
Invited participation at Liberty Fund colloquium on the theme Liberty and Authority in the Thought of Robert Bellarmine, Hermosa Beach, CA (March 1 - 4, 2018)
Panel discussion on By Man Shall His Blood Be Shed at the Fall Conference of the Center for Ethics and Culture, University of Notre Dame (November 11, 2017)
Invited participation at colloquium on Christians in higher education hosted by First Things and the Berkeley Institute, Berkeley, CA (July 24, 2017)
Invited participation at the Seventh Annual Philosophy Workshop on the theme Aquinas on Metaphysics, Mount Saint Mary College, Newburgh, NY (June 29 - July 2, 2017)
"Aquinas on the Metaphysics and Ethics of Punishment," invited lecture at the Torrey Honors Institute at Biola University (May 8, 2017)
Invited presentation of the Cardinal Stafford Lectures at St. John Vianney Theological Seminary in Denver, CO (March 22, 2017)
Invited participation at colloquium on Christians in higher education hosted by First Things and the Berkeley Institute, Berkeley, CA (August 1, 2016)
Invited participation at the Sixth Annual Philosophy Workshop on the theme Aquinas on Politics, Mount Saint Mary College, Newburgh, NY (June 2 - 5, 2016)
Invited participation at Liberty Fund colloquium on the theme Liberty, Responsibility, and the Foundations of Libertarianism in Indianapolis, IN (February 25 - 28, 2016)
"Proving the Existence of God," invited presentation at the Elmbrook Center, Cambridge, MA (October 3, 2015)
"The Immortality of the Soul," invited lecture sponsored by the Harvard Catholic Student Association and the John Adams Society, Harvard University (October 2, 2015)
Invited participation at colloquium on higher education hosted by First Things and the Berkeley Institute, Berkeley, CA (August 3, 2015)
"The State of Natural Theology in the Twenty-First Century," presentation at conference hosted by the Claremont Center for Reason, Religion, and Public Affairs, Claremont, CA (June 13, 2015)
"The Human Soul," invited presentation at the Fifth Annual Philosophy Workshop on the theme Aquinas and the Philosophy of Nature, Mount Saint Mary College, Newburgh, NY (June 4 - 7, 2015)
"Natural Law and the Foundations of Sexual Ethics," invited presentation of the Princeton Anscombe Society's 10th Anniversary Lecture, Princeton University (April 11, 2015)
Invited participation in symposium on the book God, Reason and Reality, edited by Anselm Ramelow, Dominican School of Philosophy and Theology, Berkeley, CA (November 8, 2014)
Invited participation in colloquium on the theme What Has Athens to Do with Jerusalem? Dialogue between Philosophy and Theology in the 21st Century, Dominican School of Philosophy and Theology, Berkeley, CA (July 16 - 20, 2014)
Invited participation in the Fourth Annual Philosophy Workshop on the theme Aquinas on God, Mount Saint Mary College, Newburgh, NY (June 5 - 8, 2014)
Keynote speaker at the Talbot Philosophical Society Spring Conference, Biola University, Los Angeles (March 29, 2014)
Presentation of the Aquinas Lecture at Ave Maria University, Florida (January 31, 2014)
"The Scholastic Principle of Causality and the Rationalist Principle of Sufficient Reason," invited presentation at the conference New Scholastic Meets Analytic Philosophy, Lindenthal-Institut, Cologne, Germany (December 7 - 8, 2013)
"An Aristotelian Argument for the Existence of God," invited lecture at a symposium on the theme Thomas Aquinas and Philosophical Realism at The Catholic Center, New York University (November 9, 2013)
Invited participation in workshop on Criminal Punishment in the United States: Practice and Philosophy, Salvatori Center at Claremont McKenna College (May 24 - 25, 2013)
Invited participation in First Things seminar on Christian Smith's What is a Person?, New York (April 8 - 9, 2013)
"Aquinas and the Immaterial Aspects of Thought," invited lecture at the Blackfriars Aquinas Seminar, Blackfriars Hall, Oxford University (February 14, 2013)
"Capital Punishment in the Scholastic Natural Law Tradition," invited presentation at workshop on criminal justice at the Salvatori Center, Claremont McKenna College (January 17 - 19, 2013)
"Natural Theology, Revealed Theology, Liberal Theology," invited presentation at First Things seminar on Robert Bellah's Religion in Human Evolution, New York (December 10 - 11, 2012)
"Neuroscience and the Immaterial Aspects of Thought," invited presentation at the symposium on Creation and Modern Science at the Dominican House of Studies in Washington, DC (April 14, 2012)
"Natural Theology Must Be Grounded in the Philosophy of Nature, Not Natural Science," invited presentation at the conference Can Science Inform Our Understanding of God? at Franciscan University of Steubenville (December 2-3, 2011)
"The Medieval Principle of Motion and the Modern Principle of Inertia," invited presentation at the Society for Medieval Logic and Metaphysics session at the American Catholic Philosophical Association meeting in St. Louis, MO (October 29, 2011)
Invited participation at Liberty Fund colloquium on Frank S. Meyer and the Fusion of Freedom and Tradition in Indianapolis, IN (May 19-22, 2011)
"Hayek, Popper, and the Causal Theory of the Mind," invited presentation at the Society for the Advancement of Behavioral Economics conference in San Diego, CA (August 2-5, 2010)
"Existential Inertia," invited presentation at a conference on Metaphysics: Aristotelian, Scholastic, Analytic at Strahov Monastery in Prague, Czech Republic (June 30-July 3, 2010)
Invited participation at Liberty Fund colloquium on Liberty and the Family in Cleveland, OH (August 13-16, 2009)
"Classical Natural Law Theory, Property Rights, and Taxation," invited presentation at the Social Philosophy and Policy Center conference on Ownership and Justice at Bowling Green State University in Bowling Green, Ohio (September 18-21, 2008)
Invited participation at Loyola Marymount University colloquium on Consciousness: A Hindu-Catholic Dialogue (March 17, 2007)
"Self-Ownership, Libertarianism, and Impartiality," invited presentation at a symposium on Impartiality and Partiality in Ethics sponsored by the department of philosophy at the University of Reading, England (December 1-2, 2006)
Invited participation at Liberty Fund colloquium on Liberty and Responsibility in Adam Smith in Holland, MI (July 16-21, 2006)
"Social Justice Reconsidered: Austrian Economics and Catholic Social Teaching," invited presentation of the Hayek Memorial Lecture at the 2005 Austrian Scholars Conference in Auburn, AL (March 17-19, 2005)
Invited participation at Liberty Fund colloquium on Liberty in the Early and Late Works of Robert Nozick in Tucson, AZ (January 6-9, 2005)
Invited participation in workshop on Capitalism and Morality hosted by the department of philosophy at the University of North Carolina at Chapel Hill (April 9-10, 2004)
"Personal Identity and Self-Ownership," invited presentation at the Social Philosophy and Policy Center conference on Personal Identity at Bowling Green State University in Bowling Green, Ohio (April 1-4, 2004)
"Why Searle is a Property Dualist," colloquium presentation at the American Philosophical Association Pacific Division meeting in Pasadena, CA (March 24-28, 2004) [abstract from Proceedings and Addresses of the American Philosophical Association, vol. 77, no. 3]
"Wittgenstein, Subjectivity, and Private Language," colloquium presentation at Loyola Marymount University, Los Angeles, CA (March 26, 2004)
"Personal Identity and Self-Ownership," invited participation at Current Research Workshop at the Institute for Humane Studies at George Mason University in Fairfax, VA (January 30, 2004)
"Naturalism, Evolution, and Hayek's Philosophy of Mind," invited presentation at the American Institute for Economic Research conference on Dewey, Hayek, and Embodied Cognition: Experience, Beliefs, and Rules in Great Barrington, MA (July 18-20, 2003)
"The Inconceivability of Zombies," colloquium presentation at Loyola Marymount University, Los Angeles, CA (February 4, 2003)
"There Is No Such Thing as an Unjust Initial Acquisition," invited colloquium presentation at Bowling Green State University in Bowling Green, Ohio (July 11, 2002)
Invited participation at Liberty Fund colloquium on Liberty and Responsibility in Robert Nozick's Anarchy, State, and Utopia in Bozeman, MT (May 30-June 2, 2002)
"Hayek on Tradition," presented at Austrian Scholars Conference 8 in Auburn, AL (March 2002)
Invited participation at Liberty Fund colloquium on Hayek on Law, Legislation, and Liberty in Bozeman, MT (May 31-June 3, 2001)
"Qualia: Irreducibly Subjective but Not Intrinsic," presented at the fourth Toward a Science of Consciousness conference at the University of Arizona, Tucson (April 2000) [abstract published in Consciousness Research Abstracts: Toward a Science of Consciousness 2000]
"Hayek's Solution to the Mind-Body Problem," poster presentation at the third Toward a Science of Consciousness conference at the University of Arizona, Tucson (April 1998) [abstract published in Consciousness Research Abstracts: Toward a Science of Consciousness 1998]
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Commencement address at the Dominican School of Philosophy and Theology, Berkeley, CA (May 24, 2025)
"Five Proofs of the Existence of God" invited talk at St. Vitus Catholic Church in Northridge, CA (August 16, 2024)
"Do You Have an Immortal Soul?" invited talk sponsored by the Thomistic Institute, United States Military Academy at West Point (January 25, 2024)
"What is Matter?" invited talk sponsored by the Thomistic Institute, UCLA (February 19, 2020)
"What is Matter?" invited talk sponsored by the Thomistic Institute, Cornell University (February 11, 2020)
Invited talk on laws of nature sponsored by the Thomistic Institute, Stanford University (April 17, 2019)
Invited talk on "Socialism versus the Family," The Heritage Foundation, Washington, D.C. (February 11, 2019)
Invited talk on natural law and capital punishment sponsored by the Thomistic Institute, Baylor University (April 12, 2018)
Invited talk on natural law and capital punishment at Thomas Aquinas College, Santa Paula, CA (March 23, 2018)
Invited talk on natural law and capital punishment sponsored by the Thomistic Institute, Brown University (February 6, 2018)
Co-moderated "A Conversation with Bishop Robert Barron and William Lane Craig," Claremont McKenna College (January 13, 2018)
Invited talk on scientism sponsored by Science and Faith Examined, California Institute of Technology, Pasadena, CA (December 1, 2017)
Invited talk on conscience at Holy Rosary Parish Philosophy Conference, Portland, OR (November 4, 2017)
Invited talk on scientism sponsored by the Thomistic Institute, UC Berkeley (October 19, 2017)
Invited talk on scientism sponsored by the Thomistic Institute, UCLA (May 31, 2017)
Invited talk on natural theology co-sponsored by the Thomistic Institute and St. Thomas Aquinas Parish at the University of Virginia (January 28, 2017)
"Against Scientism," invited talk at the Tilden Study Center, UCLA (May 1, 2015)
"What We Owe the New Atheists," invited lecture at Thomas Aquinas College, Santa Paula, CA (April 4, 2014)
Invited presentation of lectures at the Envoy Institute's Catholic Apologetics Academy event at the Sacred Heart Retreat House, Alhambra, CA (November 23, 2013)
Author's Interrogatory on The Last Superstition, Saint Mary's College of California, Moraga, CA (May 9, 2013)
"Is Capital Punishment Just?" invited lecture at California State University at San Bernardino (March 15, 2013)
"An Aristotelian Proof of the Existence of God" Newman Lecture given at Our Lady of Wisdom Church and Catholic Student Center, University of Lousiana at Lafayette (March 2, 2013)
Lecture tour on the theme Answering Atheism sponsored by the Catholic Adult Education Centre of the Archdiocese of Sydney (July 23-29, 2012)
Invited lecture at seminar on the theme "Does God Exist?" sponsored by the Catholic Newman Club at Cal Poly Pomona (February 25, 2012)
Invited lectures at the Faith and Reason Institute at Gonzaga University (February 15-16, 2011)
Discussion of The Last Superstition at the Southern California C. S. Lewis Society meeting at Azusa Pacific University (September 16, 2009)
Invited lectures at conference on Answering Atheism and the Culture of Doubt sponsored by the Envoy Institute of Belmont Abbey College (July 10-12, 2009)
St. Augustine's Press symposium on The Last Superstition in South Bend, IN (December 13, 2008)
"Aristotle's Revenge: Why Science Cannot Eliminate Purposes from Nature," invited presentation of the Science, Faith, and Culture Lecture sponsored by the Center for Research in Science at Azusa Pacific University in Azusa, CA (February 27, 2008)
"Civic Philosophy in the Natural Law Tradition(s)," presentation at the Philosopher-Citizen Institute colloquium at Pasadena City College in Pasadena, CA (April 7, 2006)
Participation in Philosopher-Citizen Institute symposium on the theme "Are our founding American principles universal, timeless, and still worth fighting for?" at Pasadena City College in Pasadena, CA (November 13, 2005)
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Invited talks at the Thomistic Institute Student Leadership Conference, Dominican House of Studies, Washington, D.C. (July 10 - 14, 2019)
Invited participation in the 2016 Thomistic Seminar on the theme Aquinas and the Philosophy of Nature, Princeton, NJ (August 7-13, 2016)
Invited participation in the 2014 Thomistic Seminar on the theme Aquinas, Christianity, and Metaphysics, Princeton, NJ (August 3-9, 2014)
Invited to lead Institute for Humane Studies/Liberty Fund graduate student conference on Property Rights and Freedom in Boston, MA (November 3-5, 2006)
Invited presentation of lectures on "Foundations of Natural Rights," "Conceptions of Social Justice," and "The Minimal State and its Critics" at the Institute for Humane Studies student seminar on Liberty and Society at Emory University in Atlanta, GA (June 19-25, 2004)
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