This book compiles the lessons and best practices of working in the complex and evolving public health setting of Los Angeles County, as told by leaders of LA County's Department of Public Health. Los Angeles County's combination of urban centers, extensive suburbs, and low-income, rural, and agricultural communities renders public health challenges that are diverse in scope and unmatched in scale. Through stories of both success and challenges from practice, this book offers a practical guide to effective health policy and program interventions for individuals, teams, practitioners, and departments on any scale. All facets of public health practice are illustrated through case-specific chapters, including coverage of core capacities, health promotion and protection, emergency response, and service delivery. The book addresses techniques for improving population health such as cross-cutting interventions and intersectoral actions, as well as targeted and tailored programs, services, policies, and partnerships.