 O'Brien disagreed, feeling that Kudrow was flattering him and asserting he was happy as a writer.In his speech given at Class Day at Harvard in 2000, O'Brien credited "The Simpsons" with saving him, a reference to the career slump he was experiencing prior to his being hired for the show.From 1991 to 1993, O'Brien was a writer and producer for "The Simpsons".