I have a career now, and I have to say, five years ago I didn't. I'm 50, and you never know what works, but I think part of that is because - in this way that can't be defined but which can be examined - we cannot work alone.

I can be incredibly angry with someone, I can be incredibly critical, but... I went through a period where I was reading a lot of memoirs of guards in holocausts and serial killers. I like to understand why people do bad things.

I make films that are very personal, and I always have. It's kind of the only thing that I think I have to offer as a filmmaker: the intimacy I've had with experience in a particular world, so the film comes from things I've seen and things I've felt. It gets transformed by the process. I don't think I'd ever start making a film until I had both the intimacy with the subject and the distance to make it live in a certain way.

I'm interested in what actors reveal about themselves through the structure of the character.

To be a creative person and be a professional, as an artist you have to be able to withstand pain, rejection, and for some, a lot of bad feelings, but you have to be able to look through those.

I've worked with non-professional actors, I've worked with movie stars, I've worked with kids, I've worked with older people, and I've found my job as a director is to cast them well and to understand what they need on set to bring the material to life.

I have a career now, and I have to say, five years ago I didn't. I'm 50, and you never know what works, but I think part of that is because - in this way that can't be defined but which can be examined - we cannot work alone.