Rob Penhallurick is the author of Studying Dialect (Palgrave Macmillan, 2018), Studying the English Language (Palgrave Macmillan, 2003, 2010), and editor of Debating Dialect: Essays on the Philosophy of Dialect Study (University of Wales Press, 2000). He has also written and co-written several books on Welsh English and its varieties, and many essays on dialect study, varieties of English, and teaching the history of the English language. Rob is a contributor to The Electronic World Atlas of Varieties of English (http://ewave-atlas.org), Language in the British Isles (Cambridge University Press), The Mouton World Atlas of Variation in English, The Penguin Atlas of British & Irish History, and the Varieties of English Handbook (De Gruyter Mouton). He has worked for three of the major dialect surveys of Europe: the Atlas Linguarum Europae, the Survey of English Dialects, and the Survey of Anglo-Welsh Dialects.