Conversation so far:
What did Yip Harburg do in his early life?
Yip Harburg attended Townsend Harris High School, where he and Ira Gershwin worked on the school paper and became lifelong friends.
Did Yip Harburg go to college?
After World War I, Yip Harburg returned to New York and graduated from City College - later part of the City University of New York, in 1921.

Question: What did he do after college?
Self-contained rewrite: What did Yip Harburg do after college?