- "Global Governance and the Universal Common Good," in Alpha Omega 13/2 (May-August, 2010): 45-66.
- "Ever Ancient, Ever New: Caritas in Veritate and Catholic Social Doctrine," in Alpha Omega 13/1 (January-April, 2010): 269-89.
- "Personalism" (with Jan Olof Bengtsson) in The Stanford Encyclopedia of Philosophy (November 12, 2009).
- "The Church and Economic Development," Logos 12/4 (Fall 2009): 115-132.
- "Deus Caritas Est and Catholic Social Doctrine," Alpha Omega 12/1 (January-April, 2009): 45-56.
- "The Springtime of John Paul II," First Things (April, 2009).
- "Why Socrates Was Wrong: Original Sin and Moral Theology," in Il Peccato originale: Una prospettiva Interdisciplinare, (Pedro Barrajón and Thomas D. Williams, eds.), (Rome: Libreria Editrice Vaticana, 2009): 173-191.
- "Theology of the Body and Humanae Vitae," Alpha Omega 11/3 (September-December, 2008): 365-386.
- "Abortion and Catholic Social Doctrine," Nova et Vetera 6/3 (2008): 645-662.
- "Benedicto en América: Pregón de la esperanza," Editorial for Ecclesia XXII/2 (2008): 131-137.
- "The One and the Many: Unity, Plurality and the Free Society," Alpha Omega 10/3 (September-December, 2007): 387-399.
- "Moral Theology and the Christian Obligation to Fruitfulness," Alpha Omega 10/1 (January-April, 2007): 3-30.
- "Why Men Don't Pray," Catholic Men's Quarterly 3/4 (Winter-Spring 2007): 43-46.
- "Heterologous Embryo Transfer and the Meaning of 'Becoming a Mother,'" Chapter 9 of Human Embryo Adoption: Biotechnology, Marriage, and the Right to Life (New York: The Westchester Institute for Ethics and the Human Person, 2006): 229-249.
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- "Deus caritas est: dimensión pastoral," Ecclesia 20/3 (2006): 291-302.
- "What Dignitatis Humanae Didn't Say," Alpha Omega 9/3 (2006): 123-32..
- "The Myth of Religious Tolerance," Crisis Magazine (June 2006): 2-7.
- "Ten Myths of Religious Freedom," National Catholic Register 82/2 (Jan. 8-14, 2006): 9.
- "Forming Religious and Diocesan Priests: Points of Convergence," Seminarium XLV/3 (July-September 2005): 679-99.
- "The Least of My Brethren: The Ethics of Heterologous Embryo Transfer," The Human Life Review XXXI/3 (Summer 2005): 87-98.
- "La pena capital: Un análisis ético," Ecclesia, 19/2 (2005): 181-201.
- "Ethics Accessible to Reason: A Synopsis of the Natural Law Question in Moral Theology," Alpha Omega 8/2 (2005): 163-98.
- "Beyond Distributive Justice," Logos 8/1 (Winter 2005): 90-101.
- "'Rights Talk'—Right or Wrong? Aquinas, Wojtyla and Love," Sacerdos 11/54 (November-December 2004): 18-25.
- "On Refusing Holy Communion to Anti-Life Legislators: Canonical, Moral and Pastoral Considerations," Alpha Omega 7/3 (2004): 377-92.
- "La doctrina social de la iglesia," Sacerdos (edición en lengua española) 11/53 (Sept-Oct. 2004): 30-36.
- "What Is Thomistic Personalism?" Alpha Omega 7/2 (2004): 163-97.
- "Animal Welfare and Christian Stewardship," Sacerdos 11/51 (May-June 2004): 20-25.
- "Francisco de Vitoria and the pre-Hobbesian Roots of Natural Rights Theory," Alpha Omega 7/1 (2004): 47-59.
- "La dignidad de la persona humana," Ecclesia, XVII/1 (January-March, 2003): 29-36.
- "Some Ethical Reflections on Reproductive and Therapeutic Cloning," Alpha Omega 5/3 (September-December 2002): 391-396.
- "The Question of Human Dignity," Catholic Dossier 6/4 (July-Aug 2000): 22-29.
- "Capital Punishment and the Just Society," Catholic Dossier 4/5 (Sept-Oct 1998): 28-36.
- "Values, Virtues, and John Paul II," First Things 72 (April, 1997): 29-32.
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- "El Problema de la inducción," Sapientia (May-Aug 1993): 152-66.
- "St. Augustine's Vision of Happiness" Sapientia (Sept-Dec 1992): 263-72.
