The thing that would probably surprise most people was that Dr. Martin Luther King was a very reluctant leader. He felt very shocked at times that he had been chosen for this path, but he also understood that he was chosen for this path. He had several moments of acute doubt as to if he was up for the task - when people were injured in the protests he took it very personally, let alone when they were killed.

There is still a fundamental misunderstanding, when it comes to observing that when someone is black and someone is white, then that difference is enough to warrant the idea that they shouldn't be together. We are so much more alike in nature than we are different, and my ambition with the roles I choose to do is to break down that prejudice, by showing how much I - as a man - am just a man.

I truly believe slavery is why, as a by-product, we still have a disproportionate amount of black men incarcerated in America. It is an extension of that legacy, and that's not going to start to diminish until black people have a new sense of themselves that isn't tied to slavery and feeling inferior. I think the church can be instrumental in that, in terms of repentance, reconciliation and just being more embracing of each other - not just on Sunday, but in life generally.

When I am playing a role far away from me with an accent that is not mine I always employ a dialect coach. I am almost always playing someone that has an accent that is not mine.

I know I had my equivalents in Adrian Lester and Lenny James when I was at drama school. I remember David Harewood doing 'Othello' at the National, and Adrian Lester having done Cheek by Jowl's famous 'As You Like It and Company' at the Donmar. Not necessarily performances I saw, but just the fact they happened was massively encouraging.

Asher means 'happy and blessed' which embodies my eldest. Caleb means 'stubborn and tenacious dog' and I can't even tell you how much that is my little boy! It was a useful warning.

I truly believe that one of the things that has been lacking in the USA is a spirit of repentance about the injustices of slavery and the injustices of segregation and racism generally.