The Office of Population Research (OPR), founded in 1936, is the demographic research and graduate training center at Princeton University. The field encompasses a wide range of specializations that span substantive and methodological subjects in the social, mathematical, and biological sciences. Building on its historical strengths in signature fields such as demographic methods, fertility, health and mortality, OPR researchers have embraced fields that are currently prominent in population studies, such as international migration and development, children, youth and families, biosocial interactions, health and wellbeing, poverty and inequality, as well as various aspects of social and economic inequality. In addition, OPR researchers are involved in new fields of inquiry such as epigenetics, biodemography, social epidemiology, and web-based experimentation. OPR affiliated faculty are some of the nation's foremost researchers on poverty and social inequality in the United States. Collectively, their work has had a significant impact on social policy. An important emphasis of OPR faculty is city life and the urban poor (Edin), with studies that focus on crime and urban poverty (Sharkey), housing insecurity and eviction (Desmond, The Eviction Lab), low-income fathers (Nelson), and the relationship between government institutions and the urban poor (Fernandez-Kelly). OPR researchers have examined racial residential segregation in American cities and its consequences for poverty, academic achievement, and health among African Americans (Massey, Sharkey), the role of family structure, race, and social class in child outcomes (Espenshade, The Future of Families and Child Wellbeing), the influence of racial, socioeconomic, and gender disparities on educational and health outcomes (Jennings, Conley), racial differences in health and labor-market outcomes between U.S.-born and foreign-born individuals in the United States (Hamilton). OPR is affiliated with the Eviction Lab, run by Matthew Desmond.