Juan Manuel Hernández-Campoy is Professor in Sociolinguistics at the University of Murcia, Spain. His books include Style-Shifting in Public (with J.A. Cutillas-Espinosa, 2012), Diccionario de Sociolingüística (with P. Trudgill, 2007), Metodología de la Investigación Sociolingüística (with M. Almeida, 2005), and Geolingüística (1999). He is the Co-Editor with J.C. Conde-Silvestre of the Handbook of Historical Sociolinguistics (Wiley-Blackwell, 2012).