Philip Zimbardo's 1971 Stanford University experiment, employing college students to play prison guards and inmates, became one of the most controversial episodes in modern psychology.

Philip G. Zimbardo, the psychologist behind the controversial “Stanford Prison Experiment” that was intended to examine the psychological experiences of imprisonment, has died. He was 91.

Dr Zimbardo is remembered for an ill-fated 1971 prison study in which he recruited college-aged males to spend two weeks in a mock prison in the basement of a building on the Stanford campus.

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Philip Zimbardo, the psychologist behind the controversial "Stanford Prison Experiment" in which participants playing prison guards became abusive, has died aged 91. Stanford University announced his death on Friday,

Zimbardo's 'Prison Experiment,' a landmark and controversial study, was shut down after six days, but its implications have had a profound effect.