Grissom is a character who doesn't really want people poking around in his life. He likes to poke around in his work.
William Petersen

Grissom comes from a place where we know he had a deaf mother, he was raised in a silent household, on some level, had a father who potentially was not around and he learned what he knew by himself in the back yard, with bugs and animals. He's not comfortable being a supervisor and that's his problem.
William Petersen

If I stayed a football player, my career would have been over 20 years ago. As it is, my knees are shot. I found I got the same good feeling in acting that I had in sports, but I found I could have a more profound impact on people.
William Petersen

Theater in Chicago will always be my first love. It started careers for me and about 50 of my friends. We all love coming back. As soon as the TV show is over, I'll be back in Chicago, doing live theater.
William Petersen

Now I'm seen by more people in one episode than I was in 20 years of theatre and movies. It's gratifying to have an impact on 25 million people a night, but I can say goodbye to my lunch-pail life as a working actor. I'm scared I might be a celebrity.
William Petersen

We knew all along we were making a good show, so its success was not a surprise to me. What has surprised me is the magnitude of this show's success. More people see me now in one episode than saw me in 20 years of movies and theater!
William Petersen

I didn't want to play a lawyer. I didn't want to play a doctor. I didn't want to play a single dad. I wanted to do something I felt I could learn from, something that would be a challenge and something that would not dry up.
William Petersen

The beard is here because I got tired of shaving and Grissom, subsequently, got tired of shaving. Grissom, like any other 50-year-old man, is going through a series of mid-life changes. Who knows, he may start drinking.
William Petersen