Charles Tilly was Joseph L. Buttenweiser Professor of Social Science at Columbia University, and before his death in 2008 was the author of Identities and Social Ties (Paradigm 2005), Trust and Rule (Cambridge 2005), Democracy (Cambridge 2007), and Contentious Performances (Cambridge 2008). He was the first winner of the Albert Hirschman prize for distinguished contributions to the social sciences from the Social Science Research Council.
Sidney Tarrow is Maxwell M. Upson Emeritus Professor of Government and Visiting Professor of Law at Cornell University. His latest books are Strangers at the Gates: Movements and States in Contentious Politics (Cambridge 2012), The Language of Contention: Revolutions in Words, 1789-2012 (Cambridge 2013) and War, States, and Contention (Cornell 2015). He is a fellow of the American Academy of Arts and Science and a holder of the John McCarthy Prize for Social Movement Scholarship.