David Willis is Reader in Historical Linguistics at Cambridge University. He has worked extensively on various aspects of the Welsh language, its syntax, its historical development and its linguistic geography as was as theoretical syntax and language variance and change in general. He has authored a number of books including Syntactic Change in Welsh (OUP 1998), The Syntax of Welsh (CUP 2007) and The Development of Negation in the Languages of Europe and the Mediterranean (OUP 2016). He also directs two substantial research projects on Welsh linguistics: A Historical Corpus of the Welsh Language 1500-1850 and Syntactic Atlas of Welsh Dialects.
David Willis, ‘Datblygiad cystrawen y rhifolion yn y Gymraeg’, Gwerddon, 28, March 2019, 64-87.