One of the first great "method" actors.
I think method acting was a bit overrated myself

Brando had some great roles, and did a great job in many, as did Newman and Dean. But there were often scenes where they all seemed to be pushing it a bit -- the emotion, the angst, the noir... Again, a distraction from what were often brilliant roles and performances.
They tended to grow out of it, IMO, and performed better in later life.
BTW, Steve McQueen kicked all of their tulips and Chuck Norris too

Charon