Public Health Sciences (PHS) is a multidisciplinary department in the Biological Sciences Division that includes core public health fields including biostatistics, epidemiology, health economics, health services research, health behavior, and global health.  The department mission is to improve the health of human populations and reduce disparities by expanding knowledge of factors that affect health, by advancing diverse methods for carrying out such research, and by training the next generation of innovative public health scholars and professionals. Our faculty design and implement observational and experimental studies in both community and clinical settings, and we develop and implement complex analytic methods to understand the determinants of health, the efficacy of interventions, and the structure and financing of health care at the population level. Bringing together these fields in one department underscores their commonality and enhances opportunities for interdisciplinary research. Substantively, faculty research themes include social, economic, and environmental determinants of health both within the U.S. and across the globe, genetics and disease, the economics of health care, and the evaluation and implementation of new technologies in public health and clinical care. In terms of methodological expertise, our faculty develop innovative approaches in: infectious disease modeling, multilevel, clustered and longitudinal data; clinical trials; administrative health data; and statistical methods to assess the genetic and molecular basis of disease.