Duanduan Li is a lecturer of Chinese, and currently director of the Chinese Language Program at Columbia University.Irene Liu was director of the Chinese Language Program at Columbia University.Lening Liu is a senior lecturer of Chinese in the Department of East Asian Languages and Cultures at Columbia University.Hailong Wang is a lecturer of Chinese in the Department of East Asian Languages and Cultures at Columbia University.Zhirong Wang is a lecturer of Chinese in the Department of East Asian Languages and Cultures at Columbia University.Yanping Xie, a speech and language pathologist, was a lecturer of Chinese in the Department of East Asian Languages and Cultures at Columbia University.