(Ph.D., Harvard University). Her research interests include the history of political thought (particularly Rousseau, Kant, Hegel, and Marx); democratic theory; nationalism; political obligation, authority, and state legitimacy; rights to sovereignty and territory; the ethics of migration and borders; climate change and climate justice; and theories of collective agency and collective responsibility. She is the author of Liberal Loyalty: Freedom, Obligation, and the State (2009), and Territorial Sovereignty: A Philosophical Exploration (2019), and many journal articles in political philosophy. She is the current Editor-in-Chief of Philosophy and Public Affairs.