The play has to work for the super fans, and not speak down to them, and yet it had to play to those people who maybe had never read a Harry Potter book or seen the films.

If the play works in an emotional and engaging way purely from what's on the page, then what's on the stage will be the icing on the cake. If the play didn't work as a play on its own terms, none of the magic, none of the special effects or theatricality of it all, would add up to anything.

One of the things that's different about London and the English market is that theater and film and television are all based in London. It's not quite the same as in the States where if the playwright here wants a successful TV or film career, they're whisked away by Hollywood.

I think that's so particularly exciting about this moment in time is all the new platforms that are now existing, the Netflixes and the Hulus and Amazons and so and so forth; I mean they are really doing what pay TV was doing twenty years ago. So a show like Dancing On The Edge gets to have a digital life after it's playing on Starz. I think what's exciting is how these new platforms are providing more opportunities both for first-run programming on the one hand but also for second plays for shows that have appeared first either on traditional broadcast or on cable.

I have, over the years brought an enormous number of plays to television starting obviously with Nicholas Nickelby and then things like Angels In America or in Wit with Emma Thompson and Mike Nichols. So, yes, I do find that very interesting and I'm sure that down the road there will be plays that I'll want to do that way.

I live in New York, so I'm used to the audiences that cheer and clap through a play. It is unusual for London audiences.

You never know, until you put a play up for an audience, whether it's going to work. Things you think will work don't, and things you're not sure about work really well.