Harry Morgan (born April 10, 1915) is an American actor. Morgan is perhaps best known as Colonel Sherman T. Potter on M*A*S*H (1975–1983), Pete Porter on both Pete and Gladys (1960–1962) and December Bride (1954–1959), Detective Bill Gannon on Dragnet (1967–1970), and Amos Coogan on Hec Ramsey (1972–1974). He has appeared in more than 100 films..