Conversation so far:
What was Mercury Theatre?
in 1937, Welles and Houseman founded their own repertory company, which they called the Mercury Theatre.
What did the company do?
Welles was executive producer.
What role did Houseman play?
CANNOTANSWER.
Did they write productions?
Caesar, Welles's modern-dress adaptation of Shakespeare's tragedy Julius Caesar.
How were their shows received?
Joseph Cotten later described as "so vigorous, so contemporary that it set Broadway on its ear..
Did they receive any other great reviews?
"I think he was the greatest directorial talent we've ever had in the [American] theater," Lloyd said.
Did he receive any awards?
Such was the success of the Mercury Theatre that Welles appeared on the cover of Time magazine.

Question: What year did he appear?
Self-contained rewrite: What year did Welles appear?