John M. Darley

John M. Darley (born April 3, 1938) is Dorman T. Warren Professor of Psychology and Public Affairs, Emeritus at Princeton University. He is the son of noted professor of psychology, John G. Darley (1910–1990). He has a Ph.D. from Harvard University in Social Relations.

Darley is best known, in collaboration with Bibb Latané, for theories which explore why people do not always intervene (i.e. offer aid) at the scene of an emergency, a research interest largely stemming from the tragic case of Kitty Genovese, the New Yorker who was murdered in a New York suburb in March 1964 in the presence of 38 witnesses.