Isidoros (né Charalampos) Katsos is Assistant Professor of Philosophy and Theological Epistemology at the Theology Faculty of the National and Kapodistrian University of Athens.

Studies:
  • Dr Jur in Human Rights, Sustainable Development, Ecology and Culture from the Freie Universität Berlin (2009)
  • PhD in Philosophy and Theology from the University of Cambridge (2019), under the supervision of Rowan Williams. 
  • Studies: Law in Athens, Paris, and Berlin. Philosophy and theology in Athens and Cambridge. 

Current academic affiliations:
  • Fellow of the Royal Historical Society
  • McDonald Distinguished Senior Fellow, Center for Law and Religion, Emory University 
  • Member, Cambridge Centre for the Study of Platonism
Temporary positions (2025-2026):
  • Visiting Scholar, St Edmund's College, University of Cambridge
  • Visiting Scholar, Theology Faculty, University of Notre Dame

Honorary positions:
  • Co-chair of the Unit Religion and Philosophy in Antiquity Seminar, Society of Biblical Literature (SBL)
  • Co-chair of the Philosophy of Religion Group, International Orthodox Theological Association (IOTA) 

Previous appointments:
  • British Academy Postdoctoral Fellowship, Faculty of Theology, University of Oxford
  • Junior Research Fellowship, Campion Hall, University of Oxford
  • Research Associate, Von Hügel Institute for Critical Catholic Enquiry, University of Cambridge
  • Senior Fellowship at the Center for the Study of Christianity, Fordham University
  • Postdoctoral Fellowship, Center for the Study of Christianity, Hebrew University of Jerusalem

Author of books: 
  • The Metaphysics of Light in the Hexaemeral Literature: From Philo of Alexandria to Gregory of Nyssa (Oxford University Press, 2023)
  • Nachhaltiger Schutz des kulturellen Erbes: Zur ökologischen Dimension des Kulturgüterschutzes (Nomos, Dike, Facultas, 2011) [under his birth name, as Charalampos Katsos]

Other Key Publications:

  • "Is There an Orthodox Concept of Natural Theology?" in Vasilios N. Makrides and Eudoxie Delli (eds), Intersections of Orthodox Christianity with Modern Science: Current Perspectives from Theology and Philosophy (Volos Academy Publications, 2025), 107-150
  • "An Apology for the Apology: Gregory of Nyssa's Philosophy of Light and Why It Matters," in Johannes Zachhuber and Anna Marmodoro (eds), Gregory of Nyssa: On the Hexaemeron: Text, Translation, and Essays (Oxford University Press, 2025), 177-199
  • "A Letter that Killeth: Gregory of Nyssa on How (Not) to Read Scripture, Platonically," Modern Theology 40:1 (2024), 147-171
  • "On the Trinity: An Ecumenical Conversation," Nova et Vetera 22:2 (2024), 183-198
  • "'Atheism' and Arguments for the Existence of God in Early Christianity: What Is the Problem?" in Vasso Kinti and Philemon Paionides (eds), Festschrift in Honour of Professor Stelios Virvidakis (Ekkremes, 2024), 346-359 [in Greek]
  • "An Eastern Orthodox Approach to Religious Freedom," in Norman Doe and Dimitrios Nikiforos (eds), Legal Thought and Eastern Orthodox Christianity: The Addresses of Ecumenical Patriarch Bartholomew I (Routledge, 2023), 83-92
  • "Self—Soul—Body: What the Church Fathers Saw but We Might Miss," in Christos Karayannis et al. (eds), Festschrift in Honour of Archbishop Hieronymos II (NGO Apostoli, 2023), 507-516
  • "Basil and Desmond on Wonder and the Astonishing Return of Christian Metaphysics," in Paul Tyson (ed.), Astonishment and Science: Engagements with William Desmond (Cascade Books, 2022), 169-181
  • "Light from Light: The Metaphysics of Light of the Early Church," in Piotr AshwinSiejkowski, Ilaria Ramelli, and John Anthony McGuckin (eds), The T&T Clark Companion to the Early Church (T&T Clark, 2022), 466-482

Teaching and Research Interests
His teaching and research focus on Christian philosophy and the intersections of theology, philosophy, ecology, and human rights in the age of AI.

Particular areas of expertise:
• Christian Philosophy (broadly conceived), with special focus on Christian Platonism
• Natural Theology
• Science and Orthodox Theology
• Human Rights and Eco-Theology
• Theology and Philosophy of Mind
• Human Identity and Meaning in the Age of Artificial Intelligence

Supervision
Fr. Isidoros welcomes inquiries from prospective master and doctoral students interested in the following research areas:
• Christian hermeneutics
• Theology, Philosophy, and Allegory
• Philosophy and Theology as a Way of Life
• Theology as 'True Philosophy'
• Metaphysics of Light
• Natural Theology in the Long Origenian Tradition
• Theology and Human Rights
• Mind and Body, especially the Hard Problem of Consciousness
• Meaning of Life in the Age of Artificial Intelligence
• Philo of Alexandria (any philosophical aspect)
• Clement of Alexandria (any philosophical aspect)
• Origen (any philosophical aspect)
• Plotinus (Philosophy of Mind)
• Cappadocian Fathers: Anthropology, Ethics, Physics, Metaphysics, Philosophy of Mind, Cosmology 

Pastoral Ministry
As a Greek Orthodox archpriest (Archimandrite), Fr. Isidoros serves a historic parish in the Archdiocese of Athens, at the foot of the Acropolis.