Yuan Chang (simplified Chinese: 张远; traditional Chinese: 張遠; pinyin: yuǎn zhāng;born November 17, 1959) is an American virologist and pathologist who co-discovered Kaposi's sarcoma-associated herpesvirus (KSHV) and Merkel cell polyomavirus, two of the seven known human oncoviruses.Chang was born in Taiwan and moved to the United States as a young child. She was raised in Salt Lake City, Utah and received an MD from the University of Utah College of Medicine.