Conversation so far:
Who is Woody Guthrie?
Woody Guthrie was an American singer-songwriter, one of the most significant figures in American folk music.
Where did Woody Guthrie live before California?
Woody Guthrie lived in Oklahoma and Texas before migrating to California.
Did Woody Guthrie find work in California?
Woody Guthrie achieved fame with radio partner Maxine Lefty Lou Crissman as a broadcast performer of commercial hillbilly music and traditional folk music.

Question: Who did he work for?
Self-contained rewrite: Who did Woody Guthrie work for at the radio station?