 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.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.He served as the Minister of Transportation and Communications in the Republic of China under the administration of President Ma Ying-jeou from 2008 until 2013.