Theodore R. Brennan is Professor of Ancient Philosophy at the Cornell University.

Brennan's interests in Ancient Philosophy are fairly extensive: he has read and studied over the whole period, from Presocratics to Late Platonists. Most of his publications have come from the center of that period, specifically the Hellenistic era: Epicureans, Stoics, and Skeptics.

He is a Visiting Fellow at CAS in January 2015 upon invitation from Dr. Philipp Brüllmann (CAS Junior Researcher in Residence 2014/15).