I am a professor of sociology at the University of Wisconsin–Madison. I study how people make decisions about migration and fertility and the implications of these decisions for population change. My current projects include the links between pregnancy survival and the health of cohorts, residential change and crime, anticipatory migration behavior, demographic responses to the diffusion of health risks, and the reconstruction of hidden population traits. My research has been funded by the NIH, NSF, William T. Grant Foundation, and Robert Wood Johnson Foundation. I am the director of the Center for Demography and Ecology, the training director for the Collaborative for Reproductive Equity, and on the executive committee of UW–Madison’s Health Disparities Research postdoctoral scholars program.