 After becoming assistant professor in 1947, in 1958 he became full professor.He taught many graduate students who went on to careers in the field, including Yu Ying-shih, Kao Yu-kung, Chang Fu-mei, Chang Chun-shu, and Rulan Chao Pian.His first book, "Money and Credit in China" (中國的貨幣與信用) (Harvard-Yenching Institute 1952) was a slim volume of little over one-hundred pages, but provided the foundation for research by many scholars because it clarified some three-hundred basic terms, put trends in chronological order, and put these trends against the political and military historical background.