Patrick Weil is a historian specializing in immigration and citizenship issues. In 1994, Weil became director of research at the National Center for Scientific Research attached to the Center for Social History of the 20th Century of the University of Paris. He is also a visiting professor at the Faculty of Law at Yale University and a professor at the School of Economics, Paris.
Weil works on policies implemented in France and across the world, including minority integration, inequality, religion and national identity, and American immigration and nationality policy.
Weil worked as chief of staff of the State Secretariat for Immigration from 1981 to 1982. In 1997, he was head of a mission to propose nationality and immigration policy reforms. Between 1996 and 2002, Weil was a member of the High Council for Integration. In 2003, he was a member of the Stasi commission to study the evolution of applying the principle of secularism in the republic.
In 2005, Weil helped establish the French branch of the association Humanity in Action. In 2006, he founded the NGO, Libraries Without Borders.
Weil holds an MA in public law and studied at the ESSEC Business School before obtaining a PhD in political science.