Rickard Sandell is Professor of Sociology in the Department of Social Science at Universidad Carlos III de Madrid since 2012. Professor Sandell specializes in Analytical Sociology, International Migration and Complex Systems, and Demographic Processes. He is particularly interested in the importance of social networks for people’s decision-making processes, and in how decisions concerning migration and demographic behaviour are shaped by an individual’s position in his social network. His research on those topics has been published in leading international academic journals such as American Journal of Sociology, the American Sociological Review, ACTA Sociologica, the European Sociological Review, the Scandinavian Journal of Management, Rationality and Society, International Migration Review, Demographic Research, and Nature’s Scientific Report.