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- PhD, 1983
- Islam, Metaphysics, Social and Political Philosophy, Philosophy of Mind, Free Will, Epistemology
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- PhD, 2013
- Epistemology of Logic, Epistemology, Logic and Philosophy of Logic, W. V. O. Quine, 20th Century Analytic Philosophy, General Philosophy of Science, Video Games
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- PhD, 1992
- Philosophy of Cognitive Science, General Philosophy of Science, Philosophy of Mind
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- PhD, 1991
- Information Ethics, Applied Ethics, Philosophy of Computing and Information, Buddhism
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- PhD, 2014
- Propositional Attitudes, Collective Intentionality, Philosophy of Linguistics, Collective Action, Collective Intentions, Languages, Meaning, Syntax
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- PhD, 1987
- Ancient Greek and Roman Philosophy, Philosophy of Mathematics, Epistemology
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- PhD, 1986
- Philosophy of Mind, Logic and Philosophy of Logic, Philosophy of Mathematics
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- PhD, 2005
- Science, Logic, and Mathematics, Logic and Philosophy of Logic, Information Science, Value Theory