We can assume that most people, most of the time, are moral creatures. But imagine that this morality is like a gearshift that at times gets pushed into neutral. When that happens, morality is disengaged. If the car happens to be on an incline, car and driver move precipitously downhill. It is then the nature of the circumstances that determines outcomes, not the driver's skills or intentions.

The Stanford prison experiment came out of class exercises in which I encouraged students to understand the dynamics of prison life.

At North Hollywood High School, I was shunned by everyone. I would sit down in the cafeteria, and students would get up from the table and walk away. They thought I was from the Mafia...

Companies that model best practices, that model the most upstanding principles, end up as the most profitable. It's not a trade of profits versus principles.

There are no limits to what I would do to make my classes exciting, interesting, unpredictable.

We want to believe in the essential, unchanging goodness of people, in their power to resist external pressures, in their rational appraisal and then rejection of situational temptations. We invest human nature with God-like qualities, with moral and rational faculties that make us both just and wise. We simplify the complexity of human experience by erecting a seemingly impermeable boundary between Good and Evil.

I have been primarily interested in how and why ordinary people do unusual things, things that seem alien to their natures. Why do good people sometimes act evil? Why do smart people sometimes do dumb or irrational things?