In 1982-1987, Mao was the Associate Professor, Professor and Director at the National Chiao Tung University (NCTU) in Hsinchu City. In 2003-2006, he became the Chair Professor of the College of Management of NCTU, and become the college's Dean and Professor in 2006-2008.
Political career
Mao's first service at the Ministry of Transportation and Communications was as the Administrative Deputy Minister under President Lee Teng-hui from 1993 until 2000.