British actor who was disturbing in A Clockwork Orange (1971).
His first few jobs involved serving drinks at his parents' pub and as a coffee salesman.
Trey Parker, creator of South Park, considers him to be one of his favorite actors, and invited the actor to appear, un-animated, on his show.
His nephew is actor Alexander Siddig.
He was on the TV show, Heroes, with Zachary Quinto.