Leonard Berkowitz is a prominent American psychologist known for his research in the fields of social psychology and aggression. He was born on March 21, 1926, and has made significant contributions to understanding the causes and effects of aggressive behavior. His work often focused on the role of environmental factors and social influences in shaping human actions. Berkowitz is particularly recognized for developing the cognitive neoassociation theory, which explains how negative emotions can lead to aggressive responses. Throughout his career, he has published numerous articles and books, influencing both academic research and practical applications in psychology and conflict resolution.