The Yale School of Public Health is a leader in the use of mathematical and statistical modeling to inform public health systems, policy, interventions and disease impact. Modeling applications span a variety of areas, including chronic and infectious diseases, implementation science, environmental health, behavioral determinants of health and healthcare systems. Modeling techniques can generate predictions about how a system might behave under different circumstances, permitting public health decision-makers to evaluate the possible effects of health interventions that have not yet been implemented. With faculty embedded in the departments of epidemiology of microbial diseases, biostatistics and health policy and management, YSPH has a wide impact on population health in public, private, local, national and international settings.