One hundred days ago, near the end of August, I left my position as chief medical officer of the Centers for Disease Control and Prevention (CDC) alongside two colleagues. We walked out because we could no longer stay silent as scientific integrity was eroded and the nation’s public-health infrastructure was dismantled under Robert F. Kennedy Jr., Secretary of Health and Human Services (HHS). In that moment, we urged Congress, professional societies, and public-health stakeholders to intervene