Gøsta Esping-Andersen is a Danish sociologist whose influential research on the nature of the welfare state has framed the study of the subject for nearly three decades. He is Professor of Sociology at the Universitat Pompeu Fabra in Barcelona and on the board of several scientific institutions, including the Danish National Institute for Social Research. His seminal book The Three Worlds of Welfare Capitalism was published by Polity in 1989 and has become a foundational text in the study of the modern welfare state. Its typology of three welfare-state regimes has provided an enduring framework for thinking about the relationship between democracy, capitalism and welfare. His more recent work has focused on adapting the welfare state to the needs of women and the demographic challenges of the twenty-first century, subjects which he addressed in The Incomplete Revolution, published by Polity in 2009.