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.
Dunham: Doesn't look like he's here.
Peter: Well, why don't we just poke around for a bit?
Walter: The drugs are working fast; perhaps it was the right arm.