Autobiography at Forty, the one and only autobiography written by Hu Shih himself in his lifetime, introduces his life experiences and mentality changes in his childhood, teenage and young adulthood period. This book is a “spiritual dialogue” between himself and his past, by which readers can feel his scholarly elegance, wisdom, and humor, and get to know a real Hu Shih, especially the teenage one. • The outstanding English translation is by George Kao, a famous writer and translator; part of the translation was revised by Hu Shih himself.