episode in 2016. Now, the duo has penned this upcoming installment, in which Smithers (voiced by Harry Shearer) partners up with billionaire fashion mogul Michael De Graaf (played by guest star Victor Garber).“To be able to work with Johnny on this was, like, such a dream and to be able to see how truly funny and talented he is was just, you know, super fun and rewarding,” LA-based Rob, 59, recently told The Post of his son, who also lives in LA and has himself has carved a niche as a TV writer since he graduated from college in 2016.Johnny, meanwhile, called the experience “spectacular and fulfilling,” as well as “an honor” to work with his supportive father.“I know my dad is a comedy writer.