I had very little idea who he is, and having checked imdb, I still don't. He's been in a lot of films I haven't seen (What? You thought I was into 'You Got Mail?' XD) and a couple I've seen but can't say I've noticed him.

But in this he's superb, and he should get more work! Preferably with people he obviously clicked with as well as he did his co-stars here.