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... Geier and his father, Mark Geier, who died in March, are known for peddling the thoroughly debunked falsehood that vaccines cause autism, publishing a long list of dubious articles in low-quality journals that push the idea. In particular, the two have blamed the mercury-containing vaccine preservative, thimerosal, despite numerous studies finding no link. Thimerosal was largely abandoned from vaccine formulations in 2001 out of an abundance of caution.

In 2011, an investigation by the Maryland State Board of Physicians found that the Geiers were misdiagnosing autistic children and treating them with potent hormone therapies in a treatment they dubbed the "Lupron Protocol." Mark Geier was stripped of his medical license.

David Geier, who has no medical or scientific background and holds only a bachelor's degree, was disciplined for practicing medicine without a license. ...