The three co-authors are all involved in the teaching of Chinese as a second/foreign language. Liwei Jiao is Lecturer in Chinese at the University of Pennsylvania. His publications include The Routledge Advanced Chinese Multimedia Course: Crossing Cultural Boundaries (co-authored with Kun-shan Carolyn Lee, Hsin-Hsin Liang and Julian Wheatley, Routledge 2009). Cornelius C. Kubler is Stanfield Professor of Asian Studies at Williams College. He has authored or co-authored nine books and over 50 articles on Chinese language pedagogy and linguistics. Weiguo Zhang is Emeritus Professor of Chinese Linguistics at Renmin University of China. He is currently Visiting Professor and Co-director of the Confucius Institute for Ireland at University College Dublin. He has published several books on computer language.