Albert Hadley Cantril, Jr. (16 June 1906 – 28 May 1969) was an American psychologist from the Princeton University, who expanded the scope of the field. Cantril made "major contributions in psychology of propaganda; public opinion research; applications of psychology and psychological research to national policy, international understanding, and communication; developmental psychology; psychology of social movements; measurement and scaling; humanistic psychology; the psychology of perception; and, basic to all of them, the analysis of human behavior from the transactional point of view." His influence is felt in education, law, philosophy, politics and psychiatry.