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Using a straightforward systems approach, Public Health: What It Is and How It Works explores the inner workings of the complex, modern U.S. public health system—what it is, what it does, how it works, and why it is important.The book covers the origins and development of the modern public health system; the relationship of public health to the overall health system; how the system is organized at the federal, state, and local levels; its core functions and how well these are currently being addressed; evidence-based practice and an approach to program planning and evaluation for public health interventions; public health activities such as epidemiological investigation, biomedical research, environmental assessment, policy development, and more.

Author Bernard J. (Barney) Turnock MD, MPH is currently Clinical Professor and Director of Community Health Sciences and Director of the Center for Public Health Practice at the School of Public Health, University of Illinois at Chicago. His major areas of interest involve performance measurement, capacity building, and workforce development within the public health system. He has extensive practice experience having served as Director of the Illinois Department of Public Health, Deputy Commissioner and Acting Commissioner of the Chicago Department of Health, and state program director for Maternal and Child Health and Emergency Medical Services during his distinguished career. Dr. Turnock has received awards for Excellence in Health Planning and Practice and for Excellence in Health Administration by the American Public Health Association. He was the developer and instructor for UIC's first completely online course: Public Health Concepts and Practice (CHSC 400), and the first online "Public Health 101" course for front-line public health workers. He is the author of two other Jones and Bartlett books, Public Health: What It Is and How It Works, now in its third edition, and Public Health: Career Choices That Make a Difference.