Public health professionals work to protect and improve the health of entire populations rather than individual patients. While physicians, nurses, and therapists treat one person at a time, public health professionals design interventions that prevent disease, promote healthy behaviors, and reduce health disparities across communities, states, nations, and the global population. Public health encompasses epidemiology (studying how diseases spread and identifying risk factors), biostatistics (analyzing health data to inform decisions), health policy (developing laws and regulations that protect health), environmental health (addressing pollution, water quality, food safety, and climate change), health education and promotion (designing programs that change health behaviors), global health (addressing disease in international contexts), and health services administration (managing healthcare delivery systems). Public health professionals are the reason you have clean drinking water, safe food, childhood vaccination programs, workplace safety standards, and disease surveillance systems that detect outbreaks before they become pandemics.
Education Pathway
Undergraduate (4 years): Complete a bachelor’s degree in any field. Public health, biology, sociology, political science, economics, environmental science, and statistics are all relevant. Some universities offer undergraduate public health degrees (BS or BA in Public Health) that provide foundational knowledge and may accelerate graduate study. Master of Public Health (MPH, 1 to 2 years): The MPH is the primary professional degree for public health practice. MPH programs offer concentrations in epidemiology, biostatistics, health policy and management, environmental health sciences, social and behavioral sciences, global health, and other areas. MPH programs include coursework, practicum or field experience (a real-world public health project in a community organization, government agency, or international setting), and a capstone project or thesis. Additional Degrees: Some public health professionals pursue doctoral degrees: the DrPH (Doctor of Public Health) for advanced practice and leadership, or the PhD in a public health discipline for academic research and teaching. Others combine public health with clinical degrees: the MD-MPH, DO-MPH, DDS-MPH, DVM-MPH, or nursing-MPH dual degrees integrate clinical training with population health expertise. See our MD-MPH page.
What Public Health Professionals Do
Epidemiologists investigate patterns and causes of disease in populations. They design studies, collect and analyze data, identify risk factors, track disease outbreaks, and provide the evidence that guides public health policy. During the COVID-19 pandemic, epidemiologists tracked case counts, identified transmission patterns, evaluated vaccine efficacy, and modeled intervention scenarios. Epidemiology is the core science of public health. Biostatisticians apply statistical methods to health data, designing clinical trials, analyzing survey results, modeling disease trends, and evaluating the effectiveness of interventions. Strong quantitative skills (statistics, data science, programming) are essential.
Health policy analysts and administrators develop, implement, and evaluate policies that affect population health: insurance regulations, environmental standards, food safety rules, tobacco and alcohol control policies, and healthcare delivery systems. They work in government agencies (CDC, NIH, HRSA, state and local health departments), nonprofit organizations, consulting firms, and healthcare systems. Health educators and community health workers design and deliver programs that promote healthy behaviors (nutrition education, physical activity programs, smoking cessation, sexual health education, chronic disease self-management) in communities, schools, workplaces, and healthcare settings.
Global health professionals address health challenges in international contexts: infectious disease control (malaria, tuberculosis, HIV/AIDS), maternal and child health, vaccination programs, water and sanitation, and health system strengthening in low- and middle-income countries. They work for organizations like the World Health Organization, USAID, Doctors Without Borders, the Gates Foundation, and academic global health centers. See our global health page. Environmental health scientists study the effects of environmental factors (air pollution, water contamination, toxic chemicals, climate change) on human health and develop strategies to mitigate these risks. See our climate and health page.
Salary and Job Outlook
Public health salaries vary widely by role and setting. Epidemiologists earn a median of approximately $78,520 according to the BLS. Health services managers earn approximately $110,680. Biostatisticians and data scientists in public health earn $80,000 to $130,000+. Public health program directors and senior policy analysts earn $90,000 to $150,000+. Entry-level community health positions may start at $40,000 to $55,000. Academic public health faculty salaries depend on rank and institution. The field is projected to grow significantly, with epidemiologist positions projected to grow 27 percent through 2032. The COVID-19 pandemic dramatically increased public attention to and investment in public health infrastructure, creating new funding, positions, and career opportunities.
Advantages and Challenges
Advantages: The opportunity to affect health at the population level (a single effective public health intervention can prevent more disease than any individual clinician could treat in a lifetime), intellectual diversity (public health draws on science, policy, statistics, economics, social science, and communication), the variety of career paths and settings, the growing recognition and funding of public health as critical infrastructure, and the ability to combine public health with clinical degrees for careers that bridge individual and population health.
Challenges: Lower salaries than clinical healthcare professions (especially at entry level), public health work is often invisible (successful disease prevention means the bad thing did not happen, which is hard to celebrate or fund), political polarization of public health measures (mask mandates, vaccination requirements, environmental regulations), burnout among public health workers (particularly after the COVID-19 pandemic), and the difficulty of demonstrating the impact of prevention work in metrics that resonate with policymakers and funders.
Getting Started
Middle school: Explore science, community health, and social issues. High school: Take science, statistics, and social science courses, volunteer in community health settings. Undergraduate: Study public health, biology, or social sciences, gain research or internship experience at a health department or nonprofit, and apply to MPH programs or combined-degree programs.
Data Science and Public Health: The intersection of data science and public health is one of the most rapidly growing career areas in the field. Public health data scientists use programming languages (R, Python, SAS), machine learning algorithms, geographic information systems (GIS), and large-scale data analysis to identify disease patterns, predict outbreaks, evaluate intervention effectiveness, and inform policy decisions. The COVID-19 pandemic demonstrated the critical importance of real-time data analysis in public health response, and the demand for professionals who can bridge the gap between data science and public health practice has increased dramatically. Students with quantitative skills (statistics, computer science, mathematics) who combine them with public health knowledge through an MPH or related degree are positioned for high-demand, well-compensated careers at the intersection of these fields.
Public Health and Health Equity: Addressing health disparities and advancing health equity is a central mission of public health. Public health professionals study why certain populations (defined by race, ethnicity, socioeconomic status, geography, gender identity, disability status, and other factors) experience worse health outcomes than others, and they design interventions to reduce these gaps. This work involves community engagement (partnering with affected communities to identify priorities and develop culturally appropriate solutions), policy advocacy (pushing for laws and regulations that reduce structural barriers to health), research (generating evidence about the causes of and solutions to health disparities), and program implementation (delivering services that reach underserved populations). If you are motivated by social justice and want to address the root causes of health inequality at a systemic level, public health provides the tools and the platform to do so. See our health equity page and social determinants of health page.
Career Entry Without a Graduate Degree: While the MPH is the standard professional degree for public health, many entry-level positions are available to bachelor’s-degree holders. Health education specialists, community health workers, epidemiology technicians, health department staff, and nonprofit program coordinators can begin their careers with an undergraduate degree in public health, biology, or a related field. Working in these positions for 1 to 3 years before pursuing an MPH gives you practical experience that strengthens your graduate application and helps you identify the specific concentration (epidemiology, policy, global health, etc.) that best fits your interests. Some employers also provide tuition assistance for employees pursuing graduate degrees, which can reduce the financial burden of an MPH.
References
Bureau of Labor Statistics. “Epidemiologists.” BLS, 2025. https://www.bls.gov/ooh/life-physical-and-social-science/epidemiologists.htm. Accessed March 2026.