Conversation so far:
What political party is Bill O'Reilly affiliated with?
Republican
When did Bill O'Reilly start his career as a political commentator?
1996
What stations did Bill O'Reilly work for?
CBS News, ABC News, Fox News
What year did Bill O'Reilly  work for Fox News?
1996
Is Bill O'Reilly still with Fox News?
No, O'Reilly was fired.

Question: Did he have a successful career while at Fox News?
Self-contained rewrite: Did he have a successful career while at Fox News?