Who played Mark Watney in 'The Martian'?

Who played Will Hunting in 'Good Will Hunting'? Who played Sean Maguire in 'Good Will Hunting'? In which film is Sean Maguire a character? Who played Jason Bourne in 'The Bourne Identity'? In which film is Mark Watney a character? Who played John Keating in 'Dead Poets Society'? In which film is John Keating a character? Who played Adrian Cronauer in 'Good Morning, Vietnam'?