His research interests include Greek literature, philosophy and rhetoric, ancient literary and rhetorical theory, and ancient politics, performance, and gender. Before teaching at Columbia (beginning in 2009), Marcus was a Lecturer in Classical Studies at the University of Richmond (2006-2007), before becoming Assistant Professor of Classical Studies, also at the University of Richmond (2007-2009). His Stanford dissertation entitled, "Genre, Gender, and Performance in Plato's Laws" was advised by Andrea Nightingale, Anastasia-Erasmia Peponi, and Reviel Netz.