Stanley Milgram (1933–1984) was an American social psychologist best known for his groundbreaking and controversial research on human obedience. A professor at Yale University and later at the City University of New York, he conducted a series of now-legendary experiments exploring the extent to which ordinary people would comply with authority figures, even at great moral cost. His findings, published in "Obedience to Authority," sent shockwaves through the scientific community and transformed our understanding of conformity, conscience, and evil. Milgram also introduced the concept of "six degrees of separation" through his influential small-world experiments.