Answer
Robert Forster played the role of John Cassellis in the 1969 film Medium Cool. The film is a documentary-style drama that follows a television news crew as they cover the 1968 Democratic National Convention in Chicago. Forster's character is a cameraman who becomes increasingly disillusioned with the media's portrayal of the events. The film was a critical and commercial success, and Forster's performance was praised by critics.