Conversation so far:
Did Quaid participate in theater?
In 2004, Quaid appeared on stage undertaking the starring role of Frank in the world premiere of Sam Shepard's The God of Hell.
did he participate in any other roles?
It marked the second time that Quaid starred in a Shepard play, the first being the long running Broadway hit True West.
was Quaid successful?
was well-received and -reviewed by New York City's top theatre critics.
What else happened with Quaid in theater?
In February 2008, a five-member hearing committee of Actors' Equity Association, the labor union representing American stage actors, banned Quaid for life.

Question: why was he banned?
Self-contained rewrite: Why was Randy Quaid banned for life in 2008 by the labor union that represents American stage actors?