张恒杰

Public information about Zhang Hengjie is limited, and his identity and background remain unclear; what can be confirmed is that he has published five works. Judging from their subjects, his writing spans several fields: history and foreign-culture titles such as The Soul of France: The Past and Present of Notre-Dame de Paris and the five-volume World History series; civilization-history topics such as A Brief History of Human Torture; and applied psychology, including The Front and Back of Human Nature and The Abnormal Psychology You Don't Know. Overall, his books tend to present history, culture and the complexities of human nature in an accessible way for general readers, balancing information with readability, and are distributed across categories including foreign literature, world history and applied psychology.