The current news cycle is dominated by new and exotic-sounding organisms and chemicals: PFOS, bisphenols, phthalates, Mpox, New World screwworm, Andes hantavirus, Ebola bundibugyo, Borrelia burgdorferi, dengue, and chikungunya. What do they have in common? They are difficult to pronounce, unfamiliar to most people, often poorly understood, and in some circumstances cause serious physical harm or death. Furthermore, there remains a degree of scientific uncertainty about how best to prevent, control, or mitigate many of these emerging threats to the public’s health.
This is different from the years past. For much of recent history, the environmental public health threats confronting society were more familiar, measurable, and readily understood by scientists and the public, alike. There was a high degree of confidence about what constituted safe and unsafe levels of exposure, and practical control measures existed to reduce risk. What did that look like, and why was it important?
The public health regulatory frameworks developed during the Nixon era delivered extraordinary gains in health, safety, and economic prosperity. Their success was built on addressing risks with relatively clear sources, pathways, and thresholds of concern: clean air, safe drinking water, food safety, and sanitation. Landmark legislation from that period, including the Clean Air Act, the Clean Water Act, and the Occupational Safety and Health Act, fundamentally transformed the health of the nation. The evidence is compelling.
Since 1970, emissions of the six principal air pollutants regulated under the Clean Air Act have declined by approximately 78%, even as the U.S. economy has grown by more than 300%. (1) The Clean Water Act helped reverse decades of water pollution by dramatically expanding wastewater treatment infrastructure and reducing the discharge of untreated industrial and municipal waste, resulting in substantial improvements in the quality of many of the nation’s rivers, lakes, and coastal waters. (2) Meanwhile, the Occupational Safety and Health Act transformed workplace safety. Since OSHA’s creation in 1970, workplace fatalities have fallen by more than 60%, while occupational injury and illness rates have declined by roughly 75%. (3)
Together, these laws have prevented countless deaths and illnesses, reduced healthcare expenditures, increased worker productivity, enhanced environmental quality, and created one of the most successful public health return-on-investment stories in American history. They stand as powerful evidence that well-designed, science-based regulatory frameworks can protect health, strengthen communities, and drive sustained economic prosperity. The public health playbook of the 1970s met the needs of society, and in the process arguably has instilled a palpable feeling of confidence among quantitative oriented public health professionals. A confidence that, at times, may be perceived in some circles as arrogance.
Regrettably, today’s environmental public health challenges are often less amenable to the linear interventions that guided us in the 1970s. Many modern threats arise from complex administrative systems, diffuse sources, global interconnectedness, rapidly changing technologies, and evolving ecological conditions. They are characterized by uncertainty, latency, and more intricate pathways of exposure. The next generation of public health gains will require a different playbook—one that embraces complexity, adapts to emerging science, and applies the same commitment to prevention that proved so successful over the past half century. We must deploy science, math and engineering by leading with heart, while tempering our temptation to emphasize and showcase our technical expertise. What would the chapters of that new playbook contain?
Chapter 1: Burnish a Public Health Bedside Manner Anchored in Compassion, Empathy, and Humility
Contemporary public health professionals must remain technical experts, but success in this new era will depend upon leading with our hearts, not our chi-squares, R₀s, or risk ratios. Families are understandably frightened of things they do not understand. Before they hear our science, they evaluate our intent. They ask themselves: Can I trust this person? Does this person understand me? Does this person care about me?
Chapter 2: Treat Trust as a Primary Intervention
When meeting with the public, those first few moments matter. Public health professionals should become students of emotional cues, body language, and relational communication. We must answer the questions central to public concern before pivoting to the finer points of toxicology, epidemiology, or risk assessment. Cultural, relational, and intellectual humility are not signs of weakness; they are prerequisites for influence.
Public health professionals are most effective when they communicate what is known, what is not known, and what is still being learned. In an era characterized by scientific uncertainty and rapidly evolving information, acknowledging this complex environment often strengthens credibility rather than diminishes it. People can forgive us for not having all the answers. They are less forgiving when they believe we are unwilling to acknowledge what we do not know.
Chapter 3: Remember That Human Nature Has Not Fundamentally Changed
Public health professionals sometimes speak as though distrust, anti-intellectualism, and scapegoating are modern phenomena. They are not. Since the 1721 smallpox epidemic in Boston, public health authorities have confronted skepticism, political division, and competing narratives. (4) Human beings have not fundamentally changed in three centuries.
The public’s relationship with science has always been complicated. Distrust should be viewed as a baseline condition, not a temporary aberration. The profession must stop being surprised by resistance and instead build systems and strategies that assume it will occur. Outrage and disappointment are poor substitutes for understanding history.
Chapter 4: Defend the Legitimacy of Public Health
Public health professionals devote enormous energy to correcting misinformation, disinformation, and mal information. Equally important is recognizing and confronting efforts to delegitimize the institutions, professions, and experts charged with advancing population health.
Delegitimization is more corrosive than misinformation because it attacks the credibility of the messenger rather than the accuracy of the message. If society loses confidence in public health institutions, even the best science will struggle to influence behavior. Protecting public trust therefore requires defending facts and the institutions and professionals responsible for generating and communicating them.
Chapter 5: Explain the “So What?” as well as the “What?”
Too often, public health professionals mistake information for communication. Data are not understanding. Facts alone do not compel action.
Our role as educators should be viewed as equally important as our role as regulators. We should begin public meetings and press interviews by addressing the questions people already possess. What does this mean for me? Is my family at risk? What should I do differently tomorrow? The public deserves more than hazard identification. They deserve context, relevance, and practical solutions. People rarely remember p-values or chi-squares. They remember whether you helped them understand what matters.
Chapter 6: Participate in the Information Ecosystem
Public health professionals increasingly understand that we no longer operate in a world where our expertise enjoys exclusive access to information. We inhabit an ecosystem of podcasts, influencers, social media, online communities, and competing narratives.
We should not retreat from these spaces simply because they are imperfect or nefarious. We should participate in them. We should as a practice, embrace citizen scientists. More importantly, we should listen to people with whom we disagree. Understanding opposing viewpoints is not capitulation. It is reconnaissance. If we are unwilling to enter the conversations people are already having, we should not be surprised when others shape those conversations for us.
Chapter 7: Emphasize Conformance Over Compliance and Pursue Wisdom Over Knowledge
Public health has historically excelled at generating knowledge and new insights. The next generation of leaders will need to become equally adept at cultivating wisdom.
Professionals should regularly climb what Ronald Heifetz calls “the balcony” to create time to reflect. (5) What has worked? What has not? What am I learning? How do others perceive me? What role do I play in the chaos around me?
The profession would benefit from spending slightly less time accumulating information and slightly more time extracting meaning from experience. Knowledge answers the question, “What?” Wisdom answers the question, “So what?”
Chapter 8: Develop Relationships Before You Need Them
Relationships are reservoirs of trust accumulated over time. Frequency, proximity, duration, and intensity of interactions with others create the conditions for enduring partnerships.
Public health professionals should cultivate relationships with elected officials, community leaders, journalists, clinicians, faith communities, businesses, and even critics long before urgent issues arise. During emotionally charged moments, we withdraw from those trust accounts we have spent years building.
Summary
We have crossed a professional isthmus. Behind us lies a continent where many threats were measurable, familiar, and amenable to regulation. Ahead lies a new landscape characterized by complexity, uncertainty, interconnected systems, and evolving science.
The next generation of public health leaders will require more than technical expertise. They will need critical thinking, adaptability, sound judgment, and the wisdom to act when the science is still evolving. They will need to communicate uncertainty without surrendering confidence and inspire trust without relying upon authority alone.
The great public health victories of the twentieth century were achieved through science, engineering, and regulation. The victories of the twenty-first century will require those same tools, but they will also require empathy, humility, communication, and wisdom.
The profession’s next chapter will not be written by those who know the most. It will be written by those who can translate knowledge into understanding, authority into trust, and science into service.
Perhaps that is the ultimate lesson of this new playbook: in an age of uncertainty, the most powerful instrument in public health is not regulation or technology. It is the trusted relationship between a frightened human being and a compassionate professional committed to helping them navigate the unknown.
And we will need that trust. The public health challenges ahead will not become simpler. Chronic diseases now account for the overwhelming majority of morbidity, mortality, and healthcare expenditures. The affordability and accessibility of healthcare continue to strain families, employers, and governments alike. Americans live shorter lives than many of their counterparts in developed countries. New pathogens, unfamiliar chemicals, antimicrobial resistance, climate-related disruptions, and technologies yet to be imagined will continue to emerge. Many of these challenges will be characterized by incomplete science, competing interests, and difficult tradeoffs.
No amount of expertise, regulation, or sophisticated analytics will be sufficient if the public no longer trusts the institutions and professionals asking them to act. Trust will be the indispensable currency that enables society to confront the difficult questions ahead. The twentieth century taught us how to manage risk when thresholds were known. The twenty-first century will require us to lead through uncertainty. Fortunately, uncertainty is not the enemy of public health. It is simply the condition under which public health has always operated. The next generation of public health leaders will succeed not because they possess perfect answers, but because they earn the confidence necessary to help society navigate imperfect ones.
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