He later found success in films, most notably Love Story (1970), for which he received Academy Award and Golden Globe nominations as Best Actor, Peter Bogdanovich's What's Up, Doc? (1972) and Paper Moon (1973), Stanley Kubrick's Barry Lyndon (1975), Richard Attenborough's A Bridge Too Far (1977), and Walter Hill's The Driver (1978).
From 2005 to 2017, he had a recurring role in the Fox TV series Bones as Max, the father of the show's protagonist.