Karla Hoff is a Senior Research Economist in the Development Economics Research Group and Codirector of the World Development Report 2015. Much of her work focuses on using the tools of economics to study social interactions. She has published papers in the American Economic Review that explain how good people can form bad neighborhoods, how productivity is sensitive to social setting, and how historical legacies influence the difficulty of establishing a rule of law. She won a Citation of Excellence for one of the top 50 papers from Emerald Management Review in for her 2009 Economic Journal paper with Joe Stiglitz, “Exiting a Lawless State.” She was a member of the MacArthur Research Network on Inequality and Economic Performance, 1996-2006. She coedited two books—The Economics of Rural Organization and Poverty Traps. Ongoing work evaluates a women’s empowerment project and a political theater program in India. Her work spans conceptual analysis and grassroots fieldwork. She has a BA in French from Wellesley College and a PhD in economics from Princeton. She taught English in the Peace Corps in the Ivory Coast.