Conversation so far:
What was George M. Cohan's most notable accomplishment in his later career?
Known in the decade before World War I as the man who owned Broadway, George M. Cohan is considered the father of American musical comedy
What about George M. Cohan's family or grandkids?
What did George M. Cohan enjoy doing?
George M. Cohan enjoyed his first Broadway success with “Little Johnny Jones” in 1904.
Are there any other interesting aspects about George M. Cohan besides enjoying his first Broadway success with Little Johnny Jones?
Beginning with Little Johnny Jones in 1904, he wrote, composed, produced, and appeared in more than three dozen Broadway musicals.

Question: Did he portray any other famous people?
Self-contained rewrite: Did George M. Cohan portray any other famous people?