Conversation so far:
What was Mercury Theatre?
The Mercury Theatre was an independent repertory theatre company founded in New York City in 1937 by Orson Welles and producer John Houseman.
What did Mercury Theatre do?
The Mercury Theatre produced theatrical presentations, radio programs and motion pictures.
What role did Houseman play in the work done by Mercury Theatre?
John Houseman was a partner in all the decisions made at Mercuy Theatre and was a producer on many different works.

Question: Did they write productions?
Self-contained rewrite: Did Orson Welles and John Houseman write productions?