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- PhD, 2009
- Metaphysics and Epistemology, Science, Logic, and Mathematics, History of Western Philosophy
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- PhD, 2003
- Social Philosophy, Hegel: Theory of Recognition, Persons, Social Ontology, German Philosophy, G. W. F. Hegel
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- PhD, 2019
- Philosophy of Action, Philosophy of Social Science, Attention, Scientific Research Ethics
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- PhD, 2009
- Philosophy of Mind, 17th/18th Century Philosophy, History of Western Philosophy, Metaphysics and Epistemology
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- PhD, 2021
- Epistemology, Metaphilosophy, Metaphysics, Philosophy of Biology, Philosophy of Psychology, Scientific Method, History of Science, History of Psychology, History of Biology, History of Physics
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- PhD, 2023
- Truth, Pluralism about Truth, W. V. O. Quine, Tarskian Theories of Truth, Deflationism about Truth, Correspondence Theory of Truth
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- PhD, 2009
- 13th/14th Century Philosophy, Medieval Philosophy of Mind, Medieval Political Philosophy