French psychologist, physician, anthropologist and sociologist. He was one of the first to study the influence of crowds on an individual and how crowds affect the individuality of a person. He is best known for his books “The Psychology of Peoples” and “The Psychology of the Masses”, the second book continues and supplements the conclusions of the first, but in the original (in French) and in English translations (The Psychology of Peoples and The Crowd: A Study of the Popular Mind) these books are usually published separately, and Mass Psychology is much more popular in our time and is reprinted much more often. The works of Gustave Le Bon are fundamental works in the field of mass psychology (see Mass Psychology in Chapter 1.8: Key Psychological Terms in Social Psychology).