Fassin taught in the United States from 1989 to 1994, at Brandeis University and NYU. From 1994 to 2012, he was an agrégé professor of sociology in the Department of Social Sciences at the École Normale Supérieure in Paris. Fassin currently serves as a professor of sociology at the University of Paris 8 St-Denis. He is also a researcher at Institut de Recherche Interdisciplinaire Sur Les Enjeux Sociaux. He also served as a contributing editor of Public Culture, a scholarly journal published by Duke University Press.
Fassin’s research focuses on contemporary sexual and racial politics in France and the United States and their intersections (in particular, concerning immigration issues in Europe) in a comparative perspective. He is author of L’inversion de la question homosexuelle (2005), Droit conjugal et unions de même sexe: mariage, partenariat et concubinage dans neuf pays européens (with Kees Waaldijk, 2008) and Le sexe politique. Genre et sexualité au miroir transatlantique (2009).