Estelle Herbaut is a postdoctoral researcher at Sciences Po Paris, where she is part of a country-comparative research project on the relationship between tracking policies in secondary education and the formation of social inequality over the life course. Her research interests focus on social inequalities, education policies, higher education and students' trajectories. Estelle holds a PhD in Political and Social Sciences from the European University Institute. Prior to her PhD, she has worked for several years at the OECD collecting and publishing comparative data on education policies.