F. Xavier Vila is an associate professor in the Department of Catalan Philology and Director of the University Centre for Sociolinguistics and Communication at the Universitat de Barcelona. He has published widely in the areas of sociolinguistics, demolinguistics and language policy, including Survival and Development of Language Communities: Prospects and Challenges (Multilingual Matters, 2013).

Vanessa Bretxa is a researcher in the sociology of language at the University Centre for Sociolinguistics and Communication at the Universitat de Barcelona and a part-time lecturer in the Department of Linguistics at the same university. She is also the co-editor of the academic journal Language, Society and Communication.