Public health professionals work to prevent disease, promote health, and protect entire communities rather than treating one patient at a time. Their work spans everything from tracking outbreaks and analyzing health data to designing education campaigns and shaping policy. The field is broad, and the daily reality looks very different depending on whether someone is an epidemiologist studying disease patterns, a community health worker knocking on doors, or a policy analyst drafting legislation.
The Core Functions of Public Health
The CDC defines 10 essential public health services that every community should have in place. These fall into three broad categories: assessing the health of a population, developing policies to address problems, and making sure people can actually access the care and resources they need. In practice, that means public health professionals are constantly collecting data on what’s making people sick, figuring out what to do about it, and then making sure the solution reaches the people who need it most.
Those 10 services include monitoring population health, investigating and diagnosing health hazards, communicating health information to the public, mobilizing community partnerships, creating and implementing health laws and policies, enforcing regulations, ensuring equitable access to care, building a skilled workforce, improving public health systems through research and evaluation, and maintaining the organizational infrastructure that holds it all together. A single professional rarely touches all 10, but collectively, the field covers every one.
What Epidemiologists Do Day to Day
Epidemiologists are often the most visible face of public health, especially during outbreaks. Their core job is planning and directing studies of public health problems to find ways to prevent or manage them. They collect and analyze data from observations, interviews, surveys, and biological samples to identify the causes of diseases and other health threats. Once they have findings, they communicate them to health practitioners, policymakers, and the public.
Most of their time is spent in offices and laboratories, studying data and preparing reports. They also manage programs by monitoring progress and looking for ways to improve outcomes, supervise staff, and write grant proposals to fund their research. Applied epidemiologists, who work for state and local governments, tend to be more community-facing. They address public health problems through education outreach and survey efforts directly in the neighborhoods affected. A big part of the job involves studying demographic data to figure out which groups are at highest risk for a particular disease, then designing interventions around that information.
Community Health Workers and Health Educators
Community health workers (CHWs) operate on the ground level, serving as liaisons, advocates, educators, and support systems. They help people navigate the healthcare system, enroll in health insurance, connect with providers, and access resources for issues like food insecurity, housing instability, and chronic disease management. Their strength is trust: they typically come from or have deep ties to the communities they serve, which makes them effective at reaching people who might otherwise fall through the cracks.
In Michigan, for example, a state initiative trains and integrates CHWs into communities disproportionately burdened by health inequities. Workers in that program assess ongoing needs related to social determinants of health among older adults and individuals with disabilities, conduct outreach, and provide education through culturally tailored workshops. At a Hispanic community center in the same program, CHWs have supported individuals with insurance enrollment, facilitated referrals to healthcare providers, and delivered health education sessions. The median annual wage for community health workers was $51,030 in May 2024, and employment is projected to grow 11 percent from 2024 to 2034, much faster than average.
Health educators work in a similar space but tend to focus on designing campaigns and programs rather than one-on-one navigation. They create health promotion materials for community-specific issues, help organizations build wellness programs, and work with governments to shape health education policy. Related titles include wellness coordinator, injury prevention specialist, infection preventionist, and violence prevention program coordinator.
Data, Research, and Biostatistics
A large segment of public health work happens behind a computer screen. Biostatisticians, data scientists, clinical research coordinators, and informatics specialists form the analytical backbone of the field. They design studies, build datasets, run statistical models, and translate raw numbers into actionable insights. Without this work, the rest of public health would be flying blind.
Job titles in this area range widely: data analyst, statistical programmer, vaccine researcher, public health laboratory scientist, community health analyst, and research associate are all common. These professionals work in universities, government agencies, pharmaceutical companies, hospitals, and nonprofits. Their output feeds directly into policy decisions, funding allocations, and intervention design.
Policy Analysis and Advocacy
Public health policy analysts evaluate organizational strategies in response to policy changes, conduct research on the effectiveness of current and past policies, and forecast potential outcomes for proposed ones. They communicate recommendations to stakeholders and identify areas for improvement or reform. The work requires strong skills in data collection, evaluation design, and systematic research, because stakeholders rely on policy analysts to provide evidence-based implementation recommendations.
In nonprofit organizations, policy analysts often take on an additional role as advocates for health equity, pushing for funding, legislation, or regulatory changes that benefit underserved populations. In government agencies, they may draft the language of health regulations or analyze the potential impact of a proposed law before it reaches a vote.
Environmental and Occupational Health
Environmental health professionals focus on the connections between physical surroundings and human health. They monitor air and water quality, assess workplace safety hazards, investigate exposure to toxic substances, and ensure compliance with health and safety regulations. Titles in this space include environmental health and safety coordinator, industrial hygienist, hazardous substances scientist, human health toxicologist, risk mitigation manager, and environmental quality analyst.
These roles exist across industries. A compliance investigator might inspect restaurants and housing for health code violations at a local health department. A human health risk assessor at a consulting firm might evaluate the potential impact of a chemical plant on a nearby community. An employee health services safety specialist at a manufacturing company might develop protocols to reduce workplace injuries.
Global Health Work
Public health professionals working internationally tackle problems that cross borders: infectious disease outbreaks, refugee health crises, vaccine distribution, and health system strengthening in low-resource settings. Global health epidemiologists plan studies, design surveys, and investigate communicable diseases across countries. Public health advisors oversee initiatives and communicate with policymakers and regulatory bodies to guide health policy at a national or international scale.
Some physicians in global health work directly with communities to improve health equity, while others advise organizations and governments on best-practice solutions or research systematic strategies to address barriers to care. The work often requires cultural competency, flexibility, and comfort with limited infrastructure.
Education and Career Entry Points
Most public health careers require at least a bachelor’s degree, though the specific requirements vary significantly by role. Community health workers may enter the field with a bachelor’s degree or relevant experience and training. Epidemiologists, biostatisticians, and policy analysts typically need a master’s degree, most commonly a Master of Public Health (MPH).
At the doctoral level, a PhD in a public health discipline prepares graduates for academic research careers, with rigorous coursework in advanced methods. A Doctor of Public Health (DrPH), by contrast, is designed for working professionals who want to move into leadership in public health practice, such as directing a health department or leading an NGO. Both doctoral programs generally require a prior master’s degree with coursework in epidemiology and biostatistics. The choice between them comes down to whether someone wants to generate research or apply it at an organizational level.
Where Public Health Professionals Work
The field stretches across virtually every sector. Federal agencies like the CDC, NIH, and FDA employ thousands of public health workers. State and local health departments are the largest collective employer, handling everything from restaurant inspections to disease surveillance to emergency preparedness. Hospitals and health systems hire infection preventionists, quality coordinators, and data analysts. Nonprofits and international organizations like the World Health Organization and Médecins Sans Frontières employ global health specialists, program managers, and advocates.
Private industry is a growing employer as well. Insurance companies, pharmaceutical firms, consulting groups, and tech companies all hire people with public health training for roles in data science, regulatory compliance, product safety, and health communications. The through line across all these settings is the same: protecting and improving the health of populations rather than individuals.