The Thomistic Institute

Prof. Christopher Tollefsen argues from a Thomistic natural law perspective that it is always morally wrong to intend the death of an innocent human being, contending that this absolute norm binds both private individuals and public authorities alike.

This lecture was given on November 15th, 2025, at University of Florida

For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.

About the Speakers:

Christopher Tollefsen is Professor of Philosophy at the University of South Carolina. He has published over 100 articles in journals and edited collections, and a similar number of popular essays in venues such as Public Discourse, First Things, and National Review. He is the author of Lying and Christian Ethics and the forthcoming Killing and Christian Ethics, and is co-author of The Way of Medicine: Ethics and the Healing Profession (with Dr. Farr Curlin) and Embryo: A Defense of Human Life (with Robert P. George). In 2019-20, he served as a Commissioner on the State Department’s Commission on Unalienable Rights. He has twice been a Visiting Fellow in the James Madison Program at Princeton University, and in 2024-25 was a Visiting Fellow at the DeNicola Center for Ethics and Culture at the University of Notre Dame.

Keywords: ​Absolute Prohibition Of Killing, Augustine And Aquinas, Double Effect Principle, Ethics Of Self-Defense, Human Dignity And Life, Natural Law Theory, Public Authority And Violence, Thomistic Moral Theology, War And Capital Punishment

This lecture was given on January 23rd, 2026, at Washington & Lee University.

For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.

About the Speakers:

Marshall Bierson is an assistant professor of philosophy at the Catholic University of America. His research centers on the intersection of ethics and philosophical anthropology. He is particularly focused on the work of Elizabeth Anscombe and in exploring how her Thomisticly inflected philosophical psychology clarifies moral absolutes.

Prof. Kenneth Kemp reexamines the Scopes “Monkey Trial” to show that it has been mythologized into evidence of a supposed war between science and religion, arguing instead that the real conflicts concerned constitutional law, educational policy, and competing theological and philosophical visions within Christianity.

This lecture was given on October 4th, 2023, at John Hopkins University .

For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.

About the Speakers:

Kenneth W. Kemp is an emeritus professor of philosophy at the University of St. Thomas in St. Paul, Minnesota. After receiving an MA in the History and Philosophy of Science and a PhD in Philosophy from the University of Notre Dame, he taught philosophy, first at the US Air Force Academy and last for many years at the University of St. Thomas. His research interests have included ethics as well as historical and philosophical aspects of the relation between science and religion. His published works include The War That Never Was: Evolution & Christian Theology (Cascade, 2020) and The Origins of Catholic Evolutionism, 1831–1950 (Catholic University of America Press, 2025).

Keywords: Anti-Evolution Laws, Catholic Responses To Evolution, Clarence Darrow,Constitutional Law, Myth Of Warfare Thesis, Public School Education, Scopes Monkey Trial, Science And Religion, Tennessee Butler Act, William Jennings Bryan

Prof. Jonathan I. Lunine recounts his life as a planetary scientist, tracing how early inspirations from Carl Sagan and the space race led to his work on major NASA missions exploring the solar system and distant worlds, from Voyager and Cassini to Juno and Europa Clipper.

This lecture was given on January 14th, 2025, at Dominican House of Studies.

For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.

About the Speakers:

Jonathan Lunine is the Chief Scientist at NASA’s Jet Propulsion Laboratory and Professor of Planetary Science at Caltech in Pasadena, California. Beforehand, he was the David C. Duncan Professor in the Physical Sciences and Chair of the Department of Astronomy at Cornell University. Lunine is interested in how planets form and evolve, what processes maintain and establish habitability, and what kinds of exotic environments (methane lakes, etc.) might host a kind of chemistry sophisticated enough to be called "life". He pursues these interests through theoretical modeling and participation in spacecraft missions. He is co-investigator on the Juno mission now in orbit at Jupiter, using data from several instruments on the spacecraft, and on the MISE and gravity science teams for the Europa Clipper mission. He was on the Science Working Group for the James Webb Space Telescope, focusing on characterization of extrasolar planets and Kuiper Belt objects. Lunine has contributed to concept studies for a wide range of planetary and exoplanetary missions. Lunine is a member of the National Academy of Sciences and has participated in or chaired a number of advisory and strategic planning committees for the Academy and for NASA.

Keywords: Apollo Program, Carl Sagan, Cassini–Huygens Mission, Europa Clipper, Juno Mission, Planetary Science, Titan And Saturn System, Voyager Missions, Worlds With Subsurface Oceans

Fr. Dominic Legge distinguishes the classical Catholic doctrine of creation from modern creationism by showing how a robust Thomistic account of God as the transcendent cause of all being avoids conflict with evolutionary science while deepening our understanding of what it means for the world to be created.

This lecture was given on October 20th, 2025, at The Catholic University of America.

For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.

About the Speakers:

Fr. Dominic Legge is the President of the Pontifical Faculty of the Immaculate Conception and Associate Professor in Systematic Theology at the Pontifical Faculty of the Immaculate Conception in Washington, D.C. He is an Ordinary Member of the Pontifical Academy of St. Thomas Aquinas, and holds a J.D. from Yale Law School, a Ph.L. from the School of Philosophy of the Catholic University of America, and a doctorate in Sacred Theology from the University of Fribourg in Switzerland. He entered the Order of Preachers in 2001, after having practiced constitutional law for several years as a trial attorney for the U.S. Department of Justice. He has also taught at The Catholic University of America Law School and at Providence College. He is the author of The Trinitarian Christology of St. Thomas Aquinas (Oxford University Press, 2017).

Keywords: Catholic Doctrine Of Creation, Creation And Evolution, Creation vs. Creationism, Faith and Science, Metaphysics Of Creation, Primary And Secondary Causality, Thomistic Philosophy, Universe And God