Quentin Tarantino went through Sundance Lab while preparing Reservoir Dogs. There is some test footage of him and Steve Buscemy he shot there reciting some dialogue.

He also met Terry Gilliam there, and he always recounts this first meeting fondly, so the festival led him into meeting an important mentor.

Outside of Quentin, Paul Thomas Anderson, a lot of people are called the Sundance Generation. Sundance changed cinema.