Who played Stephen Hawking in 'The Theory of Everything'?

Who played Truman Capote in 'Capote'? Who played Abraham Lincoln in 'Lincoln'? Who played Margaret Thatcher in 'The Iron Lady'? In which film is King George VI a character? Who played Solomon Northup in '12 Years a Slave'? In which film is Solomon Northup a character? Who played Cooper in 'Interstellar'? In which film is Cooper a character?