by Sharon Lerner

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Erin McCanlies was listening to the radio one morning in April when she heard Robert F. Kennedy Jr. promising to find the cause of autism by September. The secretary of Health and Human Services said he believed an environmental toxin was responsible for the dramatic increase in the condition and vowed to gather “the most credible scientists from all over the world” to solve the mystery.

Nothing like that has ever been done before, he told an interviewer.

McCanlies was stunned. The work had been done.

“That’s exactly what I’ve been doing!” she said to her husband, Fred.

As an epidemiologist at the National Institute for Occupational Safety and Health, which Kennedy oversees, McCanlies had spent much of the past two decades studying how parents’ exposure to workplace chemicals affects the chance that they will have a child with autism. Just three weeks earlier, she’d been finalizing her fourth major paper on the topic when Kennedy eliminated her entire division. Kennedy has also overseen tens of millions of dollars in cuts to federal funding for research on autism, including its environmental causes.

For 20 years, Kennedy has espoused the debunked theory that autism is caused by vaccines, dismissing evidence to the contrary by arguing that vaccine manufacturers, researchers and regulators all have an interest in obscuring their harms.

He remains skeptical of the scientists who have been funded by his own agency to study the neurodevelopmental condition. “We need to stop trusting the experts,” he told right-wing host Tucker Carlson in a June interview, going on to suggest that previous studies that found no relationship between vaccines and autism were marred by “trickery” and researchers’ self-interest.

In contrast, Kennedy told Carlson that under his leadership, and with a new, federally funded $50 million autism research initiative, “We’re going to get real studies done for the first time.”

Some autism researchers fear that the effort will manipulate data to blame the condition on vaccines. “Kennedy has never expressed an open mind, an open attitude towards what are the fundamental causes of autism,” said Helen Tager-Flusberg, a Boston University psychologist who founded a coalition of scientists concerned about his approach to autism. In a June statement, the group said the initiative lacks transparency and that Kennedy “casually ignores decades of high quality research that preceded his oversight.”

As Kennedy promotes his new initiative, ProPublica has found that he has also taken aim at the traditional scientific approach to autism, shutting down McCanlies’ lab and stripping funding from more than 50 autism-related studies. Meanwhile, he has stood by as the Trump administration encourages the departure of hundreds of federal employees with experience studying the harm caused by environmental threats and rolls back protections from pollution and chemicals, including some linked to autism.

Kennedy did not respond to requests for an interview, and an HHS spokesperson did not answer specific questions from ProPublica, including those related to the concerns of the coalition of autism scientists. “Under the leadership of Secretary Kennedy, HHS is taking action on autism as the public health emergency it is,” the spokesperson wrote. “NIH is fully committed to leaving no stone unturned in confronting this catastrophic epidemic — employing only gold-standard, evidence-based science. The Department will follow the science, wherever it leads.”

Genetic factors account for a significant portion of autism cases. Research like the kind McCanlies and other government-funded scientists have conducted over the past two decades has established that environmental factors have a role, too, and can combine with genetics. Multiple factors can even converge within the same individual. Some of those environmental risks could be reduced by the very measures the Trump administration is rolling back.

Kennedy would have been well positioned to advocate for researchers looking into the environmental causes of autism while sitting on President Donald Trump’s cabinet.

The nephew of President John F. Kennedy and son of his former attorney general, Bobby, Kennedy spent decades as an attorney battling some of the world’s most notorious corporate polluters. Once heralded by Time Magazine as one of the “heroes for the planet,” he railed against actions by the first Trump administration, complaining in his 2017 introduction to the book “Climate in Crisis” that 33 years’ worth of his work was “reduced to ruins as the president mounted his assault on science and environmental protection.”

But recently he has remained publicly silent as the Environmental Protection Agency halts research and weakens regulations on air pollution and chemicals, including some McCanlies and her colleagues have identified as possible factors in the development of autism.

“I don’t think he’s aware of my work,” McCanlies said, “or most of the literature that’s been published on what the causes of autism are.”

McCanlies was studying how a toxic chemical, beryllium, causes chronic lung inflammation in workers when she began to think seriously about autism.

It was 2005, and her college-age stepson had a job shadowing children with autism. As he described........

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