The Archbishop's library at St. Willibrord Priory specializes in Greek and Roman language and Classics, Greek and Latin Christian Patristic Studies, Byzantine studies, Philosophy and Theology. The Philosophy collection focuses on the history of Western philosophy and existential phenomenology. The Theology collection focuses on historical theology, with several specialized collections in the writings and thought of St. Thomas Aquinas, Modern Scholasticism and Contemporary Theology, with many volumes on Bernhard Häring, Karl Rahner, Hans Kung, John Macquarrie among others. There is also a specialized collection on the writings and thought of St. Augustine of Hippo.
The library also holds many volumes on English and European literature, European ancient, medieval and modern history, Church history, Christian spirituality, Art history and Heraldry.
The library holds the genealogical and heraldic archives of the de Paulo family along with the research and publications of Archbishop Dr. Craig J. N. de Paulo. A Christian Existential phenomenologist and philosopher of ambiguity, Dr. de Paulo's scholarly work has focused on the historical and philosophical influence of St. Augustine on Martin Heidegger's Sein und Zeit in addition to other hermeneutical approaches back to other ancient sources (and especially Christian patristic writers) with a philosophical focus on ambiguity, confusion, paradox, anxiety, struggle and restlessness.
Since scholarship and the intellectual life is fundamental to the Order of St. Willibrord, the Priory is in the process of developing its collections in Classics, Patristics and Contemporary Theology.