Conversation so far:
where did Rex Harrison grow up?
Harrison was born at Derry House in Huyton, Lancashire.
what year was he born?
CANNOTANSWER.
when did his stage career start?
He first appeared on the stage in 1924.
what was his first performance?
He acted in the West End of London.
was it well recieved?
appearing in the Terence Rattigan play French Without Tears, which proved to be his breakthrough role.

Question: what was he most well known for early on?
Self-contained rewrite: What was Rex Harrison most well known for early on?