Mark and David Geier were known for advocating a controversial autism treatment and publishing discredited research on vaccines. In 2004, the CDC accused them of violating research protocols, and by 2012, they faced sanctions from the state of Maryland. In 2025, Health and Human Services Secretary Robert F. Kennedy Jr. appointed one of them to investigate alleged wrongdoing related to the Vaccine Safety Datalink, which tracks vaccine-adverse reactions. While accessing anonymized health records, the Geiers were supposed to study the DTaP vaccine but conducted unauthorized analyses linking vaccines to autism instead. After their access was revoked, they continued to publish papers promoting the discredited theory regarding thimerosal, a vaccine preservative.
Mark and David Geier, a father-son duo, promoted controversial autism treatments and published discredited papers on vaccine harms, leading to accusations and sanctions from health authorities.
Health and Human Services Secretary Robert F. Kennedy Jr. selected David Geier to investigate alleged misconduct in the CDC's Vaccine Safety Datalink, a database tracking vaccination-related adverse events.
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