Yu Guo-Jun practices TCM in the city of Leshan, Sichuan province. He learned Chinese Medicine directly from senior practitioners during the Cultural Revolution and was one of the main students of Jian Er-Xun, a physician who is renowned for his work with classical formulas. Dr. Yu assisted Dr. Jiang for many years in teaching advanced classes for physicians, and then took over the classes after Dr. Jiang retired. Dr. Yu is the author of several books, he has lectured in China and the United States. Currently very well-known are his books Walk along the river Vol 1 + Vol 2.