I've done classical theaters. I played Hamlet myself and Romeo.
The irony is that, coming from a white-collar British background, I tend to play blue-collar Americans!
I found the hedge-fund guys I met all to be very, very concentrated listeners - watchful and articulate and quick to defend, if needed. They all seemed to have this contained sitting posture. The legs, if they weren't crossed at right angles, tended to be close over the knee, their hands put together.
It's an unfair comparison because when things are developed in the UK, they're developed at script stage only.
I've discovered just how symbiotic the relationship is between writers, directors and actors. They ask the same questions and strip down texts in exactly the same way.
I'm a slow starter.