What connects Steve Martin Billy Connolly and Marshall Brickman?

Steve Martin, Billy Connolly, and Marshall Brickman are all comedians who have worked together on several projects. Martin and Connolly are both actors and comedians, while Brickman is a writer and director. They have collaborated on several films, including "The Jerk" (1979), "Dead Men Don't Wear Plaid" (1982), and "Roxanne" (1987).