TalkJarvis
George Lucas quit the Directors Guild of America in 1971.
Lucas left the DGA over a dispute regarding the opening credits of Star Wars.
The DGA had strict rules about opening credits at the time.
Lucas wanted to have the credits at the end of the film.
Lucas decided to quit the DGA instead.
This move prevented Lucas from being able to direct major studio films.
Lucas went on to create his own production company, Lucasfilm.
Lucasfilm produced Star Wars and other successful films.