Two days after the ouster of Susan Monarez as CDC director on Aug. 27, HHS confirmed to BioWorld that James O’Neill is serving as acting director. O’Neill was previously Deputy Secretary of Health and Human Services. He has also served as the CEO of the SENS Research Foundation, which merged with Lifespan.io in 2024. The resulting Lifespan Research Institute describes itself as “focused on the defeat of age-related disease and the extension of healthy human lifespan” on its website.