Conversation so far:
Is Gary Cooper a film director or actor?
Gary Cooper was an American actor.
What are silent films?
A silent film is a film with no synchronized recorded sound.
Are there any other interesting aspects about silent films besides not using synchronized recorded sound?
In silent films for entertainment, the plot may be conveyed by the use of title cards, written indications of the plot and key dialogue lines.

Question: What are the films did he makes
Self-contained rewrite: What are the films Gary Cooper made?