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- PhD
- Properties, Methodology in Metaphysics, Causation, Modality, Metaphilosophy, Metaontology, Realism and Anti-Realism, Grounding, Truthmakers, Philosophy of Consciousness
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- PhD, 1987
- Philosophy of Mind, Normative Ethics, Philosophy of Law, Logic and Philosophy of Logic
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- PhD, 2000
- The Concept of Well-Being, The Concept of Equality, The Value of Equality, Social Welfare Theory, Causation, Collective Responsibility, Doing and Allowing
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- PhD, 1997
- Philosophy of Religion, Asian Philosophy, Epistemology of Religion, Religious Pluralism, Probability in the Philosophy of Religion
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- PhD, 2002
- Philosophy of Language, 20th Century Philosophy, Epistemology, Social Epistemology, Philosophy of Mind