Mari C. Jones has published extensively on language death theory and dialectology, principally in relation to Insular and Continental Norman. Major research monographs include Jersey Norman French: A Linguistic Study of an Obsolescent Dialect (2001), The Guernsey Norman French Translations of Thomas Martin: A Linguistic Study of an Unpublished Archive (2008) and Variation and Change in Continental and Insular Norman: A Study of Superstrate Influence (2015). Her co-authored textbook, Exploring Language Change (with Ishtla Singh, 2005), also engages with many aspects of language variation and change. Dr Jones has experience of editing several volumes including Language Change: The Interplay of Internal, External and Extra-Linguistic Factors (with Edith Esch, 2002), The French Language and Questions of Identity (with Wendy Ayres-Bennett, 2007), Les Langues Normandes: Pluralité, Normes, Représentations (2009) and Language and Social Structure in Urban France (with David Hornsby, 2013). She is editor of Keeping Languages Alive (with Sarah Ogilvie, Cambridge, 2013), Endangered Languages and New Technologies (Cambridge, 2014) and Policy and Planning for Endangered Languages (Cambridge, 2015).