In 1961, Chang arrived at the United States to study at Rice University, where he got his doctorate degree.

[2] During the occurrence of the Kaohsiung Incident, Chang also advocated many Taiwanese Americans to support the democratic movement going on in Taiwan.

These plans include "Flat Road Proposal" (路平專案), "Fixing the Malfunctioning Streetlights Before Sunset, After Reporting" (路燈查報、當天天黑前修復), "Park Adoption" (公園認養), "No Trash on the Ground" (垃圾不落地), and "Recycling" (資源回收), which improved the living quality of the residents.

Chang also started the first Voluntary Firefighting Communication Team of the nation, which secured the lives and properties of the residents.

[5] His cases were appealed to the Supreme Court, which found Chang guilty and sentenced him to three years in prison.

Chang served two years of his sentence in Tainan Prison, when he was given medical parole in March 2016 and released.