Conversation so far:
What did Gary Cooper do in 1925?
In early 1925, Cooper began his film career in silent pictures.
What pictures did Gary Cooper do?
Sergeant York, High Noon, and The Hanging Tree
Did Gary Cooper win any awards for Sergeant York, High Noon, or The Hanging Tree?
Yes, for all films.
Who did Gary Cooper work with?
Some actors Gary Cooper worked with include Jack Holt, Tom Mix, and Buck Jones.
What was Gary Cooper’s greatest achievement?
Cooper's greatest success was possibly his role as the Cowboy in the film Along Came Jones. The film was one of the top box-office pictures of the year.

Question: what is an important fact in this article?
Self-contained rewrite: What is an important fact about Gary Cooper?