He remains best known for his three decades in television, usually as a co-star, recurring character, or guest star on "The Golden Girls", "That Girl", "Love, American Style", "The Streets of San Francisco", "Maude", "Cannon", "Happy Days", "Welcome Back, Kotter", "Kojak", "Fantasy Island", "Cagney & Lacey", and "MacGyver", but occasionally in a lead role. In 1976, he starred in the Saturday morning children's series "Big John, Little John", as well as "The Good Guys" with Bob Denver (in what was Denver's first series after "Gilligan's Island"), from 1968 to 1970.