Yuehua Liu (1937-2019) was a distinguished Chinese linguist, winner of the Walton Lifetime Achievement Award of the Chinese Language Teachers Association of USA, professor of Beijing Language and Culture University, and a leading author of the well-known Integrated Chinese textbook series. She also taught at Wellesley College, MIT, and Harvard University.Pan Wenyu graduated from Peking University, working in Chinese as foreign language for more than 50 years. She specialized in Chinese grammar and teaching techniques.Gu Wei (Zhao Shuhua) is a retired professor of the Masters of Teaching Chinese as a Second Language, Beijing Language and Culture University. She has authored 20 papers and is the co-author of The study on Parts of Speech (1996).