David Geier

David A. Geier
Born1980 (age 45–46)
EducationUniversity of Maryland, Baltimore County B.A.
FatherMark Geier

David Geier is an American anti-vaccine activist. He is the son of fellow anti-vaccine activist Mark Geier. In 2025, he was hired by United States Secretary of Health and Human Services Robert F. Kennedy Jr. to search for evidence that federal officials had hidden information that supports the claim that vaccines cause autism.