Conversation so far:
what silent films were made by gary cooper in 1925?
In early 1925, Cooper began his film career in silent pictures such as The Thundering Herd and Wild Horse Mesa with Jack Holt.
what other silent films?
Riders of the Purple Sage and The Lucky Horseshoe with Tom Mix, and The Trail Rider with Buck Jones.
did he win any awards for these films?
CANNOTANSWER.
what was his greatest accomplishment?
Cooper also made Lilac Time with Colleen Moore for First National Pictures, his first movie with synchronized music and sound effects.
did Lilac Time succeed?
It became one of the most commercially successful films of 1928.
what is the most important fact in this article?
Cooper's first important film role was in The Winning of Barbara Worth (1926) with Ronald Colman and Vilma Banky.
did he win any awards for this role?
The film was a major success.
Critics singled out Cooper as a "dynamic new personality" and future star.

Question: who did he work with?
Self-contained rewrite: Who did Gary Cooper work with?