Master Classes How to Register for ImprovBoston Classes ImprovBoston regularly hosts nationally acclaimed improv instructors, directors, and performers, authors, playwrights, and actors as part of our Master Class Series. Our goal is to provide ongoing opportunities for our students, cast, and wider community to experience a variety of talent and perspectives. Previous Master Classes have been taught by Amy Poehler (Saturday Night Live), Christina Gausas (Late Night with Conan O'Brien), Jeff Griggs (author, Guru: My Days With Del Close), Keith Johnstone (author of Impro, creator of TheatreSports), Mick Napier (Second City), and Bob Dassie (ImprovOlympic, Los Angeles). Please check back soon for the next great Master Class that we have to offer!