History of Philosophy including Ancient, Medieval, Modern and Contemporary Philosophy, both analytic and continental.

Sven Bernecker: Kant and German Idealism.
Annalisa Coliva: Early Analytic Philosophy, especially Moore and Wittgenstein.
Sean Greenberg: Early Modern Philosophy, especially Descartes, Leibniz, Malebranche, Hume.
Bonnie Kent: Medieval Philosophy, especially Augustin, Aquinas, Ockham.
Casey Perin: Ancient Philosophy, especially Pyrrho and Pyrrhonism, Plato and Aristotle.
Duncan Pritchard: Early Analytic Philosophy, especially Wittgenstein.
Karl Schafer: Early Modern, especially Hume and Kant.
David W. Smith: Contemporary continental philosophy, especially Husserl and phenomenology.

And from our sister Department, Logic and Philosophy of Science

Jeremy Heis: Kant, Kantianism, Early Analytic Philosophy.
Penelope Maddy: Early Modern Philosophy, Early Analytic Philosophy.
Kei Wehmeier: Early Analytic Philosophy.