All info was provided Mr. Chang at The Proud Family Wiki
Mr. Chang (voiced by Phil LaMarr) is the father of the Chang Triplets. He is a grouchy man who sometimes complains. He is the stereotypical Asian tiger parent, in which he puts enormous pressure on his children to succeed. He and Proctor Lee are related. He is also one of the contenstants Oscar defeated in the 1977's Spellingbee Championship since he started talking hasty to him and Crandall Smythe.