Conversation so far:
When did Harry Reasoner go to ABC?
In 1970, Harry Reasoner was hired away from CBS by ABC.
Why did Harry Reasoner go to ABC?
Harry Reasoner left to become an anchor on ABC's newly revamped nightly newscast.
What did Harry Reasoner do while at ABC?
Harry Reasoner anchored the news alongside Smith until 1975, when he took the sole anchor position while Smith moved into a commentary role.
Did Harry Reasoner have any conflicts at ABC?
Barbara Walters and Harry Reasoner did not enjoy a close relationship; Reasoner did not like sharing the spotlight with a co-anchor and also was uncomfortable with Walters' celebrity status.

Question: Did he go back to CBS?
Self-contained rewrite: Did Harry Reasoner go back to CBS after leaving ABC?