 He continued his master's degree in the same field from San Jose State University in the United States and his doctoral degree in transportation engineering from Purdue University.In mid April 2013, commenting on Taiwan's fourth nuclear power plant construction, Chang said that the power plant has undergone rigorous integration and testing, therefore it is inappropriate to call the plant as an "assembled car".He added that the MOEA has created a team to inspect the overall system of the plant over the next six months to end the controversy.