How to Write a Compelling Sociopath

I usually respond by putting the person ill at ease because they'll come up to me in a bookstore and they'll say, so are you really like your main character or so how do you do all this research? Well, it's all hands on and then they stop asking silly questions. I mean, physically he looks a lot like me because I think the world needs more short, dumpy, bald glasses wearing, facial hairy heroes. So yeah, I'm pleading the Canadian girlfriend's defense. He's not based on me, he's based on somebody else you don't know.