Stanford Prison Experiment Ethics Heads or tails? The simple gesture of flipping a coin was the dividing line that determined ones fate. Prisoner or guard. On August 17, 1971, (Konnikova, 2015) was the morning that 24 Stanford student volunteers (Shermer, 2015) will remember for the rest of their lives. Social psychologist Phillip G. Zimbardo conducted an experiment called The Stanford Prison Experiment. This experiment took place in the basement of the psychology building located at Stanford