The co-star of TV's 'Thirtysomething' is Ken Olin. He is an American actor, director, and producer who has been active in the entertainment industry since the 1980s. He is best known for his roles in the television series 'thirtysomething' and 'Brothers & Sisters'. He has also appeared in films such as 'The Lost Boys' and 'The Invisible Man'. Olin has won several awards for his work, including a Primetime Emmy Award for Outstanding Directing for a Drama Series.