Conversation so far:
When did Montgomery Clift start his film career?
His first movie role was opposite John Wayne in Red River, which was shot in 1946 and released in 1948.
Was the film Red River a success?
Red River was selected by the American Film Institute as the 5th greatest Western of all time in the AFI's 10 Top 10 list in 2008.
What was Montgomery Clift's next film?
The Search
Did Montgomery Clift work with anyone famous in any films?
Olivia de Havilland
Did Montgomery Clift win any awards for any of his films?
He received four nominations for Academy Awards:

Question: What was another film he was in?
Self-contained rewrite: What was another film Montgomery Clift was in besides Red River or The Search?