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.

Renowned psychologist Philip Zimbardo, famed for the Stanford Prison Experiment, passed away at 91, leaving a profound legacy in psychological research.

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