Conversation so far:
Are there any other interesting aspects about the Joe Croning article?
at the end of the 1947 season, Joe Cronin succeeded Eddie Collins as general manager of the Red Sox and held the post for 11 years, through mid-January 1959.
was Joe Croninf GM of any other teams besides the red sox?
In January 1959, Joe Cronin was elected president of the American League

Question: When did he become the GM of the red sox?
Self-contained rewrite: When did Joe Cronin become the GM of the red sox?