Born in Cleveland, Morris came to Hollywood in the early 1960s. His acting experience at that time consisted of a few minor roles on the Seattle stage. He found work appearing on Television series such as The Dick Van Dyke Show (1961) and La quatrième dimension (1959) before being cast in Mission impossible (1966). Morris played quiet, efficient electronics expert Barney Collier from 1966-1973. After the show ended, Morris continued to appear in other Television series and a couple of Television movies. In 1979, he went to Las Vegas to film the television series Vegas (1978) in which he played Lt. David Nelson. He liked the city so much he decided to stay. This series lasted 2 years. In 1981, Morris survived a serious road accident and did not reappear on television for years. In 1989, he appeared in a short-lived remake of Mission impossible, 20 ans après (1988). In 1990, he was diagnosed with cancer.
