There are few visible markers of the accomplishments of public health. If epidemiologists do their jobs, nothing happens. An outbreak does not grow into an epidemic. A child does not go hungry. A would-be smoker never lights up. These achievements are rarely noticed or celebrated, but Caitlin Rivers lives for such victories. By making sure that things don’t happen, she and legions of scientists, practitioners, and policymakers change the course of history. We have many of the tools and experiences needed to prevent the next crisis, but countless challenges remain, including constantly emerging pathogens, the rapid growth of biotechnology, and the inconsistent cycles of funding for government organizations like the CDC. Progress can be slow, even with the next pandemic potentially right around the corner, but the unsung heroes in public health remain focused on their missions.