Lawrence Berkowitz

Lawrence Berkowitz was a social psychologist who, with Stanley Milgram and Leonard Bickman, helped demonstrate how people interpret a crowd’s behavior under uncertainty. Their 1968 street-corner experiment showed that a crowd can function as evidence: as more people looked toward an empty sky, more passersby assumed there was a reason to look too. The study distinguished this social proof from conformity and exposed both its everyday logic and its risk: a strategy that is often sensible can make a group less intelligent when too many people rely on it.

Identity and the 1968 Study

In 1968, Berkowitz joined Milgram and Bickman in a deliberately modest intervention in public space. The researchers arranged for people to stand on a street corner and gaze upward, then observed how passersby responded. The experiment did not depend on a speech or an explanation; its signal was simply the visible conduct of the people already looking.

The researchers varied the size of that group. With one person looking up for sixty seconds, only a tiny fraction of pedestrians stopped. When five men gazed skyward, four times as many passersby stopped. With fifteen men, 45 percent of pedestrians looked up, and a still larger group led more than 80 percent to tilt their heads toward the empty sky. Berkowitz’s role in the study is documented as part of the research team; the account does not assign him a separate task or individual finding.

Social Proof, Not Simply Conformity

The result might initially look like a demonstration of conformity, but the book presents a different explanation. The pedestrians were not necessarily yielding to peer pressure or trying to avoid reprimand. Rather, they treated the number of people looking as information: if many people were gazing upward, there was probably a reason to do so.

That distinction makes the growing crowd more than a source of pressure. Each additional observer strengthens the apparent evidence that something important is happening. In uncertain circumstances, following others can therefore be a reasonable inference, not merely passive imitation. The experiment’s empty sky makes the logic especially clear: the pedestrians acted on what the crowd implied, although there was nothing there to see.

The Crowd’s Wisdom and Its Limit

The study also marks a limit to the usefulness of social proof. If a group often knows more than any one person, following its lead can be sensible. But when too many people adopt that same strategy, they stop contributing independent judgments and instead repeat one another’s signal. The very cue that can help individuals navigate uncertainty can then undermine collective intelligence.

Berkowitz’s documented significance lies in this contrast. The street-corner experiment turns an ordinary act of looking up into a compact account of how collective behavior spreads: a crowd can help people infer what they do not know, while its influence can also become self-reinforcing. The evidence identifies Berkowitz as a collaborator in that demonstration, not as the sole author of its interpretation.