Robert F. Kennedy Jr. has promoted vaccine-autism and vaccine-injury claims since the early 2000s, founding the World Mercury Project (later Children's Health Defense) to advance those claims. The foundational vaccine-autism link derived from Andrew Wakefield's 1998 Lancet paper, retracted in 2010 after investigation found data fabrication and undisclosed financial conflicts; Wakefield was struck off the UK General Medical Council. The thimerosal-mercury hypothesis Kennedy championed was addressed by the 2004 IOM report and by Hviid et al. (2003, NEJM) among many subsequent studies, all finding no causal link. Kennedy was nominated as HHS Secretary in November 2024 and confirmed in 2025, bringing the claims into active US public health policy.