Robert Duvall is an actor.
Robert Selden Duvall ( [ duːˈvɔːl ] born January 5 , 1931 ) is an American actor and filmmaker . He landed many of his most famous roles during the early 1970s , such as Major Frank Burns in the blockbuster comedy MASH ( 1970 ) and the lead role in THX 1138 ( 1971 ) , as well as Horton Foote 's adaptation of William Faulkner 's Tomorrow ( 1972 ) , which was developed at The Actors Studio and is Duvall 's personal favorite .