Expanding and reworking dissertation on quod est and esse in Aquinas into book. This book reevaluates how to interpret Thomas's quod est-esse distinction and the relation of this doctrine to Boethius and Avicenna.
Ongoing research and writing on the modern science of human origins, its philosophical interpretation from a Thomistic perspective, and its relation to Christian teaching on Adam and Eve, the Fall, and original sin.
Hervaeus Natalis. De esse et essentia. In De quattuor materiis sive Determinationes contra magistrum Henricum de Gandavo, vol. 1 of 2, edited by Lambert-Marie de Rijk. Studia Artistarum 35. Turnhout: Brepols, 2011.
Siger of Brabant. Quaestiones in Metaphysicam. 2 vols. Edited by William Dunphy and Armand Maurer. Philosophes Médiévaux 24-25. Louvain-La-Neuve: Editions de l'institut superieur de philosophie, 1981-83. [Selections]
Siger of Brabant. Quaestio utrum haec sit vera: homo est animal, nullo homine existente. In Ecrits de logique, de morale et de physique, edited by Bernardo Bazán, 53-59. Louvain: Publicationes universitaires, 1974.
Thomas Sutton. Q. 26. In Quaestiones ordinariae, edited by Johannes Schneider. Munich: Verlag der Bayerischen Akademie der Wissenschaften, 1977.