Conversation so far:
When did Jack Benny start performing
Jack Benny had been a minor vaudeville performer before becoming a national figure with The Jack Benny Program, a weekly radio show that ran from 1932 to 1948.
What did Jack Benny do in the Jack Benny Program
Jack Benny played himself.
What was the show The Jack Benny Program about
Jack Benny is a comic, vain, penny-pinching miser, insisting on remaining 39 years old on stage despite his actual age, and often playing the violin badly.
What else can you tell me about Jack Benny's history
Jack Benny's long radio career began on April 6, 1932, when the NBC Commercial Program Department auditioned him.

Question: What did he do for the NBC department
Self-contained rewrite: What did Jack Benny do for the NBC department