For the time slots that the networks retained, CBS head Fred Silverman replaced much of the canceled programming in 1971 and 1972 with "relevant" fare. Following "All in the Family" were its many spinoffs including "Maude" and "The Jeffersons" (which premiered in 1974). Following the success of "The Mary Tyler Moore Show", the series' production company MTM Productions would develop the popular "The Bob Newhart Show". "M*A*S*H" was added to the network in 1972, placing in the top 15 shows for ten of its eleven seasons, and eventually aired the most watched single episode of any series in U.S. television history during its 1983 series finale.