Conversation so far:
When was Louis C.K. born?
09/12/1967
Where was Louis C.K. born?
Washington, DC.
Is there any information about Louis C.K.'s' parents?
Louis C.K. is the son of software engineer Mary Louise (née Davis) and economist Luis Székely.

Question: when did he start comedy?
Self-contained rewrite: When did Louis C.K. start comedy?