You want to try and bring a character to life in an honest a way as you possibly can. It doesn't matter whether he's a doctor, an actor, a car salesman or a captain of a starship. If you can bring truth and honesty to that character, then your audience will believe you.
I've always had an affinity for lawyers. My dad is a lawyer. He's retired now. My brother is a lawyer.
I've always been a big fan of time travel, and I'm very into the notion that some day we'll be able to do it. Beam me up!