Upright Citizens Brigade (UCB) is a renowned improvisational and sketch comedy group founded in 1990 by Amy Poehler, Matt Besser, Ian Roberts, and Matt Walsh. Known for its unique approach to comedy, UCB has significantly influenced the landscape of modern comedic performance, emphasizing the importance of improvisation in storytelling. The group operates theaters in New York City and Los Angeles, offering classes and performances that have launched the careers of many successful comedians and actors. UCB's signature style encourages spontaneity and creativity, making it a vital part of the comedy community.