My strength as an actor is in the theater - I know that about myself. Some actors get onstage and vanish, but I'm much better there than I am on screen.

He was also romantically linked to singer Judy Collins in the early 1970s. Duff VIII beginning with the 12th season episode "Hungry Hungry Homer" wherein Homer attempts to stop Howard K. In the early 1980s he starred in the title role of the national touring company of the musical Barnum composed by Cy Coleman.

He is most famous for his dramatic roles; however he has done narration work in educational programming on PBS and the Discovery Channel as well as some comedy (particularly his role in the Fox sitcom Titus as Ken the hard-drinking chain-smoking womanizing father of comedian Christopher Titus) and musical roles. Walter Stacy Keach Jr.