
Philip G. Zimbardo, one of the world’s most renowned psychologists, died Oct. 14 in his home in San Francisco. He was 91.
Zimbardo’s research explored how environments influence behavior. He is most known for his controversial 1971 study, the Stanford Prison Experiment.
The study, intended to examine the psychological experiences of imprisonment, revealed the shocking extent to which circumstances can alter individual behavior. To this day, it is used as a case study in psychology classes to highlight both the psychology of evil as well as the ethics of doing psychological research with human subjects.

“I began to feel that I was losing my identity, that the person that I called Clay, the person who put me in this place, the person who volunteered to go into this prison – because it was a prison to me; it still is a prison to me. I don’t regard it as an experiment or a simulation because it was a prison run by psychologists instead of run by the state. I began to feel that that identity, the person that I was that had decided to go to prison was distant from me – was remote until finally I wasn’t that, I was 416. I was really my number.”
Our study was terminated on August 20, 1971. The next day, there was an alleged escape attempt at San Quentin. Prisoners in the Maximum Adjustment Center were released from their cells by Soledad brother George Jackson, who had smuggled a gun into the prison. Several guards and some informant prisoners were tortured and murdered during the attempt, but the escape was prevented after the leader was allegedly gunned down while trying to scale the 30-foot high prison walls.









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