Guillaume Jacques has been doing fieldwork on Japhug (Gyalrongic, Trans-Himalayan) since 2002. He is currently directeur de recherche (senior researcher) at CNRS (CRLAO laboratory, Paris), and is also affiliated with INALCO and EHESS. In addition to Japhug, he has also done research on several other Gyalrongic languages (Zbu, Situ, Stau) as well as on various languages of other branches of the Trans-Himalayan family, in particular Khaling (Kiranti). Several of his PhD students have written grammars of Gyalrongic languages, including Lai Yunfan (Khroskyabs), Gong Xun (Zbu) and Zhang Shuya (Situ). His interests include language documentation, typology (in particular voice and indexation), panchronic linguistics, neogrammarian historical linguistics, language phylogeny and ethnolinguistics.