The author of Mob is Gustave Le Bon. He is studying medicine in Paris. 1866 After receiving his doctorate, he traveled to Europe, North Africa and Asia and wrote several books on anthropology and archaeology. Although he has extensive contacts and huge scientific research plans, his strong desire has never come true. The door of the university, even the door of the Academy of Sciences, has been closed to him. Le Pen was therefore excluded from the formal circle. But it is as an outsider that he works tirelessly. He made one scientific research plan after another, but never made an amazing discovery. However, his amateur research and popular science work have really improved his comprehensive skills, so he can write an outline with broad ideas more easily, use vivid and powerful words, and capture the events and opinions that attract readers intuitively and timely like a reporter. After years of hard work, he has published dozens of books and perfected the theories of comprehensive biology, anthropology and psychology. Mob: A Study of Popular Psychology describes the general characteristics of group psychology in detail, and analyzes the psychological, moral and behavioral characteristics of people in the state of group gathering. It explains why groups often show the characteristics of blindness, impulsiveness, fanaticism and credulity, and how rulers use these characteristics to establish and consolidate their own rule.