He was featured in a number of episodes of the 1970s sitcoms The Mary Tyler Moore Show (where he played no fewer than four different characters: Howard Arnell, his brother Paul, Chuckles the Clown and Dino), The Bob Newhart Show (as three characters: Don Fezler, Don Livingston and Chuck Brock), Rhoda (as Charlie Burke) and Phyllis (23 episodes as Leo Heatherton). His earliest appearance with Mary Tyler Moore was in the 1966 Dick Van Dyke Show episode "Dear Sally Rogers" (billed as Dick Schaal).
Dick Van Dyke Show guest-starred as Dick Schaal in the 1966 episode "Dear Sally Rogers", marking his earliest appearance alongside Mary Tyler Moore, before going on to play multiple roles in various sitcoms.