Detailed Instructions: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: He collaborated with Hans Toch to write a book on collective behavior, and he also investigated the difficulty of getting a seat on the subway and handed out folders to far-flung individuals in the lost letter experiment testing the "six degrees of separation" hypothesis. Earlier, he offered four dollars and fifty cents to participate in a trial of what he claimed was a new method of learning, in which one participant was an actor and all of the others administered at least three hundred volts. For 10 points, name this psychologist who designed the "obedience experiment. "
A:
Social Science