Conversation so far:
Who was his parents?
CANNOTANSWER.
Are there any other interesting aspects about this article?
O'Neill was married to Kathleen Jenkins from October 2, 1909 to 1912, during which time they had one son, Eugene O'Neill, Jr.
What else do you know about his wife?
In 1917, O'Neill met Agnes Boulton, a successful writer of commercial fiction, and they married on April 12, 1918.

Question: What did he do career wise?
Self-contained rewrite: What did Eugen O'Neill do career wise