Sci-Fi writer and actor who starred in the series Bring 'Em Back Alive, How the West Was Won, and Scarecrow and Mrs. King. He also played the role of Alan Bradley and Tron in both Tron films.
He appeared as Rick in the television show, The Mary Tyler Moore Show.
He received a Saturn nomination for his performance in the television show, Babylon 5.
He co-starred with Jeff Bridges in the Tron films.