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Berk ?zler is Lead Economist in the?Poverty, Inequality, and Human Development Progam in the Development Research Group. He received his B.Sc. in Mathematics from??in 1991 and his Ph.D in Economics from??in 2001, immediately after which he started working at the World Bank's Development Research Group. After working on poverty and inequality measurement, poverty mapping, and the 2006 World Development Report on Equity and Development, he decided to combine his interest in cash transfer programs and HIV risks facing young women in Africa by designing and implementing a large cash transfer experiment in Malawi between 2008-2010. Berk has since conducted a number of cluster-randomized field experiments on a range of topics. He is currently interested in ways to reduce unintended pregnancies, especially among adolescent females and young women.?His team is trialing approaches to increase the take-up of modern contraceptives among this population with?. He is also interested in the economics of animal welfare. He is a co-founder of and a contributor to the?.