Jay Bhattacharya, M.D., Ph.D., assumed the role of acting director at the Centers for Disease Control and Prevention (CDC) on February 14, 2026, following the departure of interim director Jim O’Neill. Bhattacharya, who currently serves as director of the National Institutes of Health (NIH), took over the leadership of the CDC amid a period of organizational restructuring within the agency.

The transition occurred as the CDC continues to address nationwide public health challenges while positioning itself ahead of the 2026 midterm election cycle. The new leadership aligns with broader federal health policy initiatives, including efforts to lower drug prices. These initiatives have been prominent in the current administration’s agenda, with past restructuring efforts aimed at strengthening the agency’s capacity to respond to such priorities.

Jim O’Neill served as acting CDC director from mid-2025 until his exit in early February 2026. Bhattacharya is now the third individual to lead the agency since the summer of 2025, marking a period of relatively frequent changes in top CDC leadership. However, his tenure as acting director remains subject to legal limitations on term length, dictated by federal statutes governing temporary appointments.

The CDC, a key federal agency under the Department of Health and Human Services, focuses on preventing and controlling disease, responding to health emergencies, and protecting public health nationwide. Its organizational structure includes associate directors and multiple centers dedicated to infectious diseases, chronic disease prevention, environmental health, and global health. The director oversees strategic planning and coordination across these divisions.

Bhattacharya holds significant experience in health policy and public health research. Before joining NIH, he worked as a professor at Stanford University, focusing on epidemiology and health economics. His appointment to lead the CDC on an interim basis indicates a move to realign the agency’s direction in line with current administration goals.

The transition at CDC leadership arrives amid an increased focus on transparency and accountability in federal health agencies. The agency’s role in managing public health crises and its readiness for emerging threats remain under close scrutiny by policymakers and the public alike. The new acting director will be responsible for continuing CDC’s operational functions and guiding its policy priorities during this sensitive period.

As acting director, Bhattacharya will manage ongoing CDC programs and collaborations with state and local public health departments. His leadership will also steer public health communication strategies and response coordination until a permanent CDC director is appointed. The agency’s work covers disease surveillance, immunization programs, emergency preparedness, and health promotion efforts across the United States.

The CDC has faced several leadership changes in recent years, reflecting broader challenges within federal health agencies to maintain consistent command during evolving health demands. This latest appointment marks a continuation of efforts to sustain agency stability and effectiveness during a critical phase for U.S. health policy implementation.