Ang was born in Xigang District, Tainan, on June 16, 1946. He graduated from Chinese Culture University with a bachelor's degree in Chinese in 1969 and from National Taiwan Normal University with a master's degree in Chinese in 1973. In September 1973, he was persecuted during the White Terror and sentenced to life imprisonment for "crimes of rebellion" (預備叛亂罪). Later, he was granted amnesty and released from prison after 6 years and 8 months.
In 2003, Ang earned his Ph.D. in linguistics from National Tsing Hua University. His doctoral dissertation was titled, "The Motivation and Direction of Sound Change: On the Competition of Minnan Dialects Chang-chou and Chüan-chou and the Emergence of General Taiwanese" (Chinese: 音變的動機與方向:漳泉競爭與台灣普通腔的形成).[1]