A friend of my mom's was a casting director so, really as kind of a lark, I had a couple of acting jobs that had just enough exposure to give me the option to continue if I wanted to. I followed through with it.

But on balance, a performer wants to feel that there's something there which stands out because you put a lot of effort into it, a lot of energy and a lot of yourself into something. I feel pretty successful about some movies I've been in that have not been greeted with a lot of enthusiasm and I do trust my own criteria.

My professional success is really important to me, and my career is really important to me. It's the most important thing to me outside of my family. I take it very seriously and work really, really hard at it. Family comes first, but this is something that's really important to me too.

I feel like fame is wasted on me.

My mother went to Radcliffe, and rather than just trying to get rich, she wanted to be a teacher and taught for over 30 years in the public schools. She's definitely got some war stories.

We wanted to show people what it was like in one of those neighbourhoods that they would never have access to, in bars that they would be too scared to go into, and a world that they would never get to see. All of that is something really unusual and rare and kind of fascinating. And the only way to do that and to make it really worthwhile was that it had to be authentic. We dedicated a lot of time and energy to making that right and real. So we found basically the worst locations that we could.

I've consciously taken on material that's a bit too much for me but not an overreach. The first movie, just about performances. 'The Town,' I learned how to work broader material, develop tension, direct bigger scenes, action sequences. 'Argo,' I experimented with film stock, widened the scope of my geography.