Mark Robin Geier

Mark Robin Geier was an American de-licensed physician and controversial professional witness who testified in more than 90 cases regarding allegations of injury or illness caused by vaccines. By 2013, Geier's medical license had been suspended or revoked in every state in which he was licensed over concerns about his autism treatments and his misrepresentation of his credentials to the Maryland Board of Health, to which he falsely claimed to be a board-certified geneticist and epidemiologist.