In episode 40 I talk to actor, comedian, director, producer, and writer Matt Besser about one of his mentors, the late great Del Close, an American actor, writer, and teacher who coached many of the best-known comedians and comic actors of the late twentieth century. In addition to an acting career in television and film, he was one of the influences on modern improvisational theater. Close is co-founder of the iO, or iO Chicago, (formerly known as "ImprovOlympic").