• Contemporary philosophy of religion
• History of Platonism-Neoplatonism
• Early modern philosophy
• Romanticism and Idealism

• The application of linguistics to theories of religious language, analogy and liturgy, with a consideration of the implications of this interaction for linguistics itself
• A critical consideration of postmodern philosophy in relation to the re-interpretation of premodern theology
• A reconsideration of the Platonic tradition in interaction with the Biblically based faiths, in particular the question of theurgy and understandings of the soul

• Modern Jewish religious thought and philosophy (esp. Moses Mendelssohn, Hermann Cohen, Franz Rosenzweig, Martin Buber, Emmanuel Levinas)
• Theories and practices of interreligious dialogue and communication
• The (contested) relationship between scripture and philosophy, both in the Jewish intellectual tradition and more generally
• Aspects of ethics, hermeneutics and theopolitics in classical rabbinic literature

Human Creations: Artefacts in the Theology of Nicholas of Cusa and Giovanni Pico della Mirandola

• Contemporary philosophy of religion
• History of Platonism-Neoplatonism
• Early modern philosophy
• Romanticism and Idealism

• varieties of apophaticism
• christology
• the doctrine of God
• theological epistemology
• intersections of theory and practise in Christian spiritualities

• The application of linguistics to theories of religious language, analogy and liturgy, with a consideration of the implications of this interaction for linguistics itself
• A critical consideration of postmodern philosophy in relation to the re-interpretation of premodern theology
• A reconsideration of the Platonic tradition in interaction with the Biblically based faiths, in particular the question of theurgy and understandings of the soul

• Theology and ethics
• Theology and international development

• Modern Jewish religious thought and philosophy (esp. Moses Mendelssohn, Hermann Cohen, Franz Rosenzweig, Martin Buber, Emmanuel Levinas)
• Theories and practices of interreligious dialogue and communication
• The (contested) relationship between scripture and philosophy, both in the Jewish intellectual tradition and more generally
• Aspects of ethics, hermeneutics and theopolitics in classical rabbinic literature

Human Creations: Artefacts in the Theology of Nicholas of Cusa and Giovanni Pico della Mirandola

The themes of temporality and dependence in Friedrich Schleiermacher's theological and philosophical writings. 

• varieties of apophaticism
• christology
• the doctrine of God
• theological epistemology
• intersections of theory and practise in Christian spiritualities

• Theology and ethics
• Theology and international development

The themes of temporality and dependence in Friedrich Schleiermacher's theological and philosophical writings. 

• Religious language and Naming God
• Science and religion, especially in relation to Creation
• Form and content in theological writing
• The symbolics of gender
• Christian origins and the metaphysics of scripture

A Philosophical Poetics of Beauty

Barnabas' doctoral thesis is titled:

• 'Finitude and Transcendence: A Study in Paul Ricœur’s Early Philosophy’

Divine Discretion: How to Evaluate Basic Beliefs about God

Anselm on Ethics

My research is titled:

Between manifestation and mystery: towards a metaphysics of mediation in French spiritualism. Félix Ravaission, Louis Lavelle and Maurice Blondel. 

The research thematises mediation and mediating movement as one of the determinative metaphysical centres of perspective for the tradition known as "French Spiritualism" (running from Maine de Biran, Félix Ravaisson, Henri Bergson through to Maurice Blondel, Louis Lavelle and  recognisably 'spiritualist' thinkers in the French tradition such as Simon Weil, Jacques Chevalier, Maurice Merleau-Ponty, and Claude Bruaire among others).

On one hand, the research has a history of philosophy/metaphysics interest in bringing to light and unpacking the insights of a rich philosophical tradition -- rich particularly for its vision of metaphysics as a never-completed task insofar as being, conceived essentially as the unfolding act, escapes every scheme of determination and is rather understood by the paradigm of manifestation and open possibility, with the "subject" always itself folded in within this unfolding of being.

On the other hand, within this vision, is the articulation of an original thought in French Spiritualism that concerns the mediation of 'ontological' incommensurables. The metaphysics of mediation it proposes is neither idealistic nor dialectical but is conceived as a "superior realism," which, in the religious thought of a Maurice Blondel, develops Leibniz's hypothesis of a vinculum substantiale (substantial union) into a full-blown Christology, by which Christ is the Mediator.

Origen's Trinitarian Logic: philosophy of logic in light of Origen of Alexandria's trinitarian theology

Language and Metaphysics in the Theology of Sergii Bulgakov

The Metaphysics of Light in the 'Hexaemeron' Literature - From Philo of Alexandria to Ambrose of Milan

Early Modern Philosophy, particularly questions of space and substance in More, Descartes or Spinoza.

A citizen eternally, In the new Rome, where Christ is Roman too: Kierkegaardain reading of citizenship in Dante's Commedia

The Trinitarian Social Ontology of Sergei Bulgakov

Philosophical and Fundamental Theology.

Human Knowledge of God and the Philosophical Theology of Henri de Lubac SJ: A Reassessment.

Bathing God in an Atmosphere of Spatiality: Henri Bergson and Analytic Philosophy of Religion

A Vulnerable Theology: Self-Perception, Relation and Transformation in Disability Theology and Meister Eckhart

Hindu-Christian philosophical theology: 'Non-Duality in Christian Vedanta'

The Contemplation of the Transcendent Heart: Tracing the ἡγεμονικόν from the Stoics to Origen