Prior to landing a spot on SNL, Moynihan was prolific at the UCB theatre. Over the course of roughly a decade, Moynihan appeared on both in-house teams and with the theatre's touring company. In addition to his work on SNL, Moynihan has made the rounds through a number of other sketch comedy projects. His credits include sketch writing for Conan O'Brien, contributing as a writer on Human Giant, and recurring appearances at CollegeHumor.