Some names into the hat:
Clint Eastwood
Meryl Streep
Jodie Foster
Bruno Lawrence (ok most will not have heard of him, but watch 'The Quiet Earth', 'UTU', or 'Smash Palace' a rubbish film, but he shines)
Michael Sheen
Katharine Hepburn
Steve Buscemi
Harry Dean Stanton
Harder to pick the non-english speaking ones:
Toshirô Mifune
Jacques Tati