Conversation so far:
What did George M.
Cohan do firts?
began writing original skits.
How many skits?
over 150 of them.
who did  he write these for?
and songs for the family act in both vaudeville and minstrel shows.
When did he write theses?
while in his teens.

Question: what was his next acomplishment?
Self-contained rewrite: what was George Cohan's next acomplishment