Which of these actors has played a whistleblower, math teacher, world champion boxer and an English commander?

Now here's a truly good actor. A Beautiful Mind is a favorite.

He's not a great singer though. They say that was a deliberate choice when he was cast as Inspector Javert in Les Miserables.

I really liked him in The Insider, with Pacino. Heavy acting chops all around.

I've not heard of Russell crowe

I am a lifelong fan of Russell Crowe, since Gladiator and the rest of his movies.

don't forget Gladiator!