Conversation so far:
Who were playwright Eugene O'Neill's parents?
Eugene O'Neill was the son of Irish immigrant actor James O'Neill and Mary Ellen Quinlan.
Are there any other interesting aspects about this article on playwright Eugene O'Neill?
Eugene O'Neill is referenced by Upton Sinclair in The Cup of Fury, by J.K. Simmons in Whiplash, and by Robert Downey Jr. in Avengers: Age of Ultron.
What else do you know about playwright Eugene O'Neill's second wife?
Agnes Boulton was a British-born American pulp magazine writer in the 1910s.
What did playwright Eugene O'Neill do career wise?
Eugene O'Neill devoted himself full-time to writing plays. O'Neill had previously been employed by the New London Telegraph, writing poetry as well as reporting.

Question: What did he write
Self-contained rewrite: What did playwright Eugene O'Neill write?