Theres a country musician I love, Townes Van Zandt.

And then from the arts, theres a guy I love, Grayson Perry.

Im a huge David Hockney fan.

Johnny Flynn, and Einstein

Credit: Jim Spellman/WireImage; Dusan Martincek/National Geographic

I wouldnt be allowed to play her, but yeah, shes up there.

I think Leonardo DaVinci would be interesting if they were to do another guy.

Did you research the theories youre discussing [in the script] or is that just by rote?

And did you talk to any real-life physicists?Oh yeah.

They were very thorough, the production.

But I did gain a basic understanding through talking.

It was like learning how to juggle from scratch.

I loved all that stuff.

I loved doing that, and the math, and talking with people about what these ideas were.

When do you feel the smartest?Right after I drink my morning coffee [laughs].

The time period youd most like to live in?I think Shakespearean London.

Whats next on your acting bucket list?Hamlet.

A genius moment youve had?

[Laughs] Oh my God.

Well, I wrote a song about Einstein long before I knew about this project.

Right-brained or left-brained, or both?I think I swing wildly between both.

I try and stay in my right brain as much as I can, but my left takes over.

Geniuspremieres Wednesday at 9 p.m.

ET on National Geographic.

This interview has been edited and condensed.