Will Smith Says He Was 'Conflicted' in Playing Dr. Bennet Omalu in 'Concussion'

The Golden Globe-nominated actor describes what it was like portraying the doctor who discovered a connection between playing football and brain damage.
5:56 | 12/15/15

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Transcript for Will Smith Says He Was 'Conflicted' in Playing Dr. Bennet Omalu in 'Concussion'
Will smith has starred in many memorable movies and he is about to add to that list with his latest, "Concussion," plays Dr. Bennett amolu. If you continue to deny nye work the world will deny my work. But men, your men continue to die. Their families left in ruins. Tell the truth! Well, we're looking up. The monitor is up there. We're looking. Hello, will. How are you? I am so good. How are you doing? Great to see you. I watched the screener. It is so powerful and really beautiful, his passion, Dr. Omalu was here yesterday. Congratulations on the golden globe nomination. Thank you, thank you very much. That's -- it's a -- going well. This one, I was a little conflicted when is first took this film so it feels good that people are responding well to it. I'm going to talk about how you were conflicted in a moment but first, following him around, he performs autopsies, you really spent a lot of time to get the sense of who this man is, didn't you. Yeah, he is such a beautiful man. He was here yesterday so he is -- he's just sweet and brilliant. He has eight degrees. You know, so he's a man of science but paradoxically he's a deeply spiritual man, you know, so it's like how he blends those two things that -- the science and the spirituality into one just gorgeous being. When someone is on his table he treats then as a patient speaking to them. Yes, I saw him perform four autopsies, so, you know, because you know I take my work seriously so I'm committed. I went in there with him and an autopsy is aggressive, it really is and went and watched him and he sees himself as a deliverer of souls, you know, so he's playing music, he's talking to the person and he sort of sees himself delivering the soul from this world to the next, you know, so as an actor it was just ecstatic to find that depth of interesting character. So we know how you feel about him. This is what he said about you yesterday. Oh, okay. He took my story and the story of cte from the depths of the California central valley to the peak of the mountain top of the American mountain under the American psyche and for that I'm profoundly grateful. He said he'd see you at the globes too in I love that guy. Do you take on an added sense of responsibility? Not the first time you've played a real-life character as you did that received Oscar nominations. Do you approach it differently? I don't it differently as much as there's a little bit more weight to it. Specifically with "Concussion," we shot in Pittsburgh. So the families of a lot of the players were on the set. Some of the locations we used were the actually places that the things happened, so there was an added burden and responsibility to the fact that these are people's lives that you're actually going to see and they'll watch the movie. And as you alluded to earlier you were conflicted in the beginning because Dr. Omalu took a lot of heat from the NFL saying you're anti-football. You're anti-sports and you too approached it at first going I'm not quite sure about it because your son plays -- My son played for four years and it was some of the most beautiful time that we have had together. This is not an anti-football movie. You know, I love football. I grew up in philly. I'm a football fan. My eagles, you know, so it was a very inconvenient truth, the reality of the science and as a parent, I knew that I didn't know when my son was playing football. I didn't know that repetitive head trauma from the game could because long-term brain injury. That's what Dr. Omalu was about, finding the truth, getting to the truth. But for me as a parent I was impelled to deliver this film to the world? And you really did. You did that. I cannot believe it's been 25 years since "Fresh prince of bel-air." I think we have some of the first episodes. Oh, no in , it all started here. You could not have known 25 years ago it would have the legs it had. Does not look like a guy nominated for a golden globe. You're going to hit the road. Yeah, about -- Jeff and I -- we never actually had a chance to go on tour because fresh prince of bel-air came on on in 1990 and our first real hit was 1988 so never really had ray chance to go on tour. You'll change that. We'll change that. All right. I'll see you out there. You'll see my face in the place. Throw on your baseball cap backwards. Advantage your move. All the best to you, and to Jada and kids. "Concussion" opens nationwide on Christmas day. Outside to ginger. That is a classic will smith dance.

This transcript has been automatically generated and may not be 100% accurate.

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