John Gerring (PhD, University of California at Berkeley, 1993) is Professor of Political Science at Boston University, where he teaches courses on methodology and comparative politics. He is the author of Party Ideologies in America, 1828-1996 (Cambridge University Press, 1998), Social Science Methodology: A Criterial Framework (Cambridge University Press, 2001), Case Study Research: Principles and Practices (Cambridge University Press, 2007), A Centripetal Theory of Democratic Governance (Cambridge University Press, 2008), Concepts and Method: Giovanni Sartori and His Legacy (Routledge, 2009), Social Science Methodology: A Unified Framework, 2d ed (Cambridge University Press, 2012), An Applied Guide to Social Science Methodology (Cambridge University Press, 2015), along with numerous articles. He served as a fellow of the School of Social Science at the Institute for Advanced Study (Princeton, NJ), as a member of The National Academy of Sciences’ Committee on the Evaluation of USAID Programs to Support the Development of Democracy, as President of the American Political Science Association’s Organized Section on Qualitative and Multi-Method Research, and as a fellow at the Kellogg Institute for International Studies, University of Notre Dame. He has received grants from the Clinton Global Initiative, the National Science Foundation, and the World Bank. He is co-editor of Strategies for Social Inquiry, a book series at Cambridge University Press. He also serves as co-PI of Varieties of Democracy (V-Dem) and the Global Leadership Project (GLP).