Wayne Knight, who famously played Newman on SEINFELD, will guest star on Y&R in September. The actor will play music promoter Irv West on September 20 and 21, who crosses paths with Mariah (Camryn Grimes), Noah (Robert Adamson), Devon (Bryton James), Tessa (Cait Fairbanks), Sharon (Sharon Case) and Daniel (Scott Grainger). Yahoo shared these photos: