Chang is Emeritus Scholar Chair of Natl. Synchrotron Radiation Res. Center (NSRRC) and honorary chair professor, Natl. Tsing Hua U. (NTHU) in Hsinchu, Taiwan. He obtained his PhD in 1975 at Polytechnic Institute of Brooklyn. He was former director of NSRRC and former vice president (NTHU); president, Physical Society of R.O.C., director general (Natural Sciences), National Science Council; commission members IUPAP and IUCr. His honours include NSC Outstanding Research Award, Sun Yet San Academic Award, MOE Academic Award; Tung Yuan Award for Sci. and Tech.; B. E. Warren Diffraction Physics Award (Amer. Crystallogr. Assoc.); Ho Chin-Duei Outstanding Honorary Award. Member/Fellow: Academia Sinica; Asian Pacific Academy of Materials Science; American Physical Society; Physical Society of R.O.C.; national chair professor; chair, Foundation for the Advancement of Outstanding Scholarship.