I am a professor of epidemiology at UNC-Chapel Hill and the author of Epidemiology By Design (Oxford University Press, 2019).Methodologically, I study epidemiologic and statistical methods for causal inference, including structural models (particularly marginal structural models), the parametric g-formula, and doubly robust models. I am most interested in causal methods for translating science into policy (the "science"​ part of "implementation science"​). These methods also have broad applicability in data science.Substantively, my work addresses the intersection of maternal health, especially pregnancy, and highly active antiretroviral therapy (HAART) for HIV in both international and domestic settings, as well as intersections between HIV and chronic diseases. I am a PI of the STAR Cohort.Specialties: Causal inference; statistics; data science; epidemiologic methods; marginal structural models; HIV and antiretroviral therapy; implementation science; reproductive health and pregnancy