Peter Bishop grew up as the neglected son of a mad scientist.
After his dad's mental institutionalization, Peter aimed to make himself as different from his father as he could. He's a college drop-out that passed for several months as a chemistry professor, along with an intuitive mathematician with a gambling problem.
Peter is now a civilian consultant for the FBI.
Walter: Look, it's a lemon zinger I believe. Not as good as the stuff I grow but it's not bad either.
Peter: Well, at least she died in a happy place.
Peter: What is this boy? How could he do this for you, enable you to see a life you didn't live?
Walter: I'm not sure, but I feel it.