Conversation so far:
what was Hitchens contribution to journalism?
Hitchens worked for the Daily Express between 1977 and 2000.
what was his role in the daily express?
initially as a reporter specialising in education and industrial and labour affairs, then as a political reporter, and subsequently as deputy political editor.
when and why did he stop being a journalist?
CANNOTANSWER.

Question: what was the highlight of his journalist career?
Self-contained rewrite: What was the highlight of Peter Hitchens journalist career?