Conversation so far:
What did Yip do in Hollywood?
Harburg worked with composers Harold Arlen, Vernon Duke, Jerome Kern, Jule Styne, and Burton Lane, and later wrote the lyrics for The Wizard of Oz.
What year did he write for wizard of Oz.?
CANNOTANSWER.
What was names of some broadway shows?
Bloomer Girl (1944).
Did he actually act or was part of the shows?
he wrote a series of "book" musicals with social messages.

Question: What year did he start writing for Hollywood or Broadway.?
Self-contained rewrite: What year did Yip Harburg start writing for Hollywood or Broadway?