Biographical Note: a native Ersu ethnographer and linguist, currently retired, used to work as a physics teacher in secondary education (Ganluo County, Sichuan Province, People's Republic of China) and as researcher at Xichang College Library. Ethnicity: Ersu Tibetan. Education level: MA. Languages: Ersu (ISO639-3:ers) native language; Chinese, Mandarin (ISO639-3:cmn), Southwestern Mandarin. Nuosu (ISO639-3:iii) basic knowledge. Bilingual in Ersu and Mandarin, married to a Chinese woman, speaks Chinese at home.