Stanley Milgram
His most famous experiment was the Milgram Study. The authority figure told the teacher to test the learner word pairs, and if the learner were to answer wrong, the teacher would have to punish the student by electric shocks which got stronger each time. Although no actual shocks were given, more than 60% had 'shocked' the learner up to full voltage. Proved that people will do things mainly because an authority figure had prompted the teacher to do so.
Philip Zimbardo
His experiment, The Stanford Prison Experiment, assessed how role playing affects attitudes. In the study, male volunteers were randomly assigned to either a "guard" role or "prisoner" role to be carried out in a mock prison. The guards were told only to maintain order, but within two days the guards began to act cruelly without reason and prisoners began to show signs of extreme stress. The experiment had to be cut short. There were no long term, but the experiment changed ethical standards for experimentation.
Solomon Asch
He conducted experiments on conformity where people had to match line segments with matching examples in front of a group of people. He found that people are likely to conform and give blatantly wrong answers when in a large group who gives unanimous response.
Leon Festinger
Creator of the Cognitive Dissonance Theory; This is the theory that explains the conflict that you feel when you attitudes are not in sync with your behaviors; You typically will change your behavior or attitude to make them align which can aid in feeling better
Muzafer Sherif
He is known for the Robber's Cave Experiment. He used a group Boy scouts in a camp. He created two separate groups who competed with each other a lot. Each group felt they were better than the other and always seems to be at odds with another. He then created a (false) emergency situation at the camp and the groups overcame their rivalry due to a superordinate goal.