Jim O’Neill Steps in as Acting CDC Chief Amid Firing, Resignations
TUESDAY, Sept. 2, 2025 — The U.S. Centers for Disease Control and Prevention (CDC) is entering a transition period as Jim O’Neill, deputy secretary at the Department of Health and Human Services (HHS), steps in as acting director.
The announcement came in a letter to CDC employees from HHS Secretary Robert F. Kennedy Jr.
O’Neill, who joined HHS in June, has experience in both the tech and public health sectors. Before his government roles, he spent years investing in biotech and technology startups, including time with the Thiel Foundation and Thiel Fellowship, founded by entrepreneur Peter Thiel, CNN reported.
He also previously served at HHS during the administration of George W. Bush, focusing on food regulations and emergency response.
His appointment dovetails a challenging period for the CDC. Director Susan Monarez was recently fired after clashing with RFK Jr. over vaccine policy. Several senior officials — including the agency’s chief medical officer, head of vaccines and data chief — resigned in protest.
Staff gathered outside the CDC’s Atlanta headquarters Thursday to honor some of the departing leaders, CNN said in a report.
O’Neill toured the CDC campus with Monarez and Kennedy last month following a tragic shooting that left DeKalb County Police Officer David Rose dead and damaged several buildings.
At his HHS confirmation hearing in May, O’Neill voiced strong support for vaccines, according to CNN, stating, “I support the CDC vaccine schedule."
He also pledged to focus on transparency, prevention and modernizing current policies.
“Our health care system is difficult to navigate, and it prioritizes pills over prevention,” he said at the hearing.
“If confirmed, I’ll help reform outdated rules, pursue transparency and gold standard science, and champion healthy lifestyles and prevention so Americans can thrive,” he said at the time.
Sources
- CNN
- Aug. 29, 2025
Disclaimer: Statistical data in medical articles provide general trends and do not pertain to individuals. Individual factors can vary greatly. Always seek personalized medical advice for individual healthcare decisions.

© 2025 HealthDay. All rights reserved.
Read this next
Kids’ Eyes Getting Worse? Air Pollution May Be to Blame
THURSDAY, Sept. 25, 2025 — Air pollution is known to raise the risk of heart disease, strokes and breathing problems, but new research suggests it may also harm something...
Lights Are Dimming For America's Brain Power, Study Says
THURSDAY, Sept. 25, 2025 — A growing number of Americans appear to be losing their brain power, particularly younger adults, a new study says. The U.S. has experienced a...
Sunny Seniors Can Bounce Back From Poor Well-Being
THURSDAY, Sept. 25, 2025 — The march of time may be relentless, but aging is not entirely hopeless if you have the right mindset, according to a Canadian study. Seniors who...
More news resources
- FDA Medwatch Drug Alerts
- Daily MedNews
- News for Health Professionals
- New Drug Approvals
- New Drug Applications
- Drug Shortages
- Clinical Trial Results
- Generic Drug Approvals
Subscribe to our newsletter
Whatever your topic of interest, subscribe to our newsletters to get the best of Drugs.com in your inbox.