Sylvie Célérier is an Emeritus Professor of Sociology at Lille University, and a member of the Lille Centre for Sociological and Economic Research and Studies (CLERSE)— CNRS UMR 8019. Alberto Riesco-Sanz is an Associate Professor of Sociology at the Complutense University of Madrid and an Associate Researcher at the Complutense Institute for the Study of Contemporary Social Transformations (TRANSOC).