Matt Besser is an American comedian, actor, writer, and director. He is best known for his work on the improvisational comedy show "Whose Line Is It Anyway?" and the podcast "improv4humans." Besser has also appeared in several films and television shows, including "The Mindy Project," "Parks and Recreation," and "The Office." He is a founding member of the Upright Citizens Brigade, an improvisational comedy troupe that has performed in New York City, Los Angeles, and Chicago.