Science
Kennedy Turns to a Discredited Vaccine Skeptic for Autism Study
A steadfast figure in the anti-vaccine movement who has helped shape Health Secretary Robert F. Kennedy Jr.’s thinking on a possible link to autism has joined his department to work on a study examining the long-debunked theory, according to people familiar with the matter.
The new analyst, David Geier, has published numerous articles in the medical literature attempting to tie mercury in vaccines to autism. In 2012, state authorities in Maryland found that he had been practicing medicine without a license alongside his father, Mark Geier, who was a doctor at the time.
Maryland authorities also suspended Mark Geier’s medical license following claims that he endangered children with autism and exploited their parents, according to state records.
Federal judges have rejected their research on autism and vaccines as too unreliable to stand up in court.
David Geier’s new government role has stunned public health experts, who had already expressed concerns about Mr. Kennedy’s decisions to cancel a long-held vaccine meeting and to cut grants focused on understanding vaccine hesitancy.
In addition, David Geier’s involvement in government research heightens their fears that vaccine confidence could be further eroded, especially after Mr. Kennedy’s recent embrace of questionable alternative treatments for measles during the sprawling outbreak in Texas.
“If we increase vaccine hesitancy and immunization rates go down further, we will see more vaccine-preventable disease outbreaks,” said Dr. Christopher Beyrer, director of the Duke Global Health Institute. “That’s how it works.”
Several experts said that appointing David Geier to work on a study of vaccine safety preordains the outcome — like having a basketball referee show up in one team’s jersey.
“You’d think you’d want a fresh eye,” said Edward L. Hunter, a former head of the Washington office of the Centers for Disease Control and Prevention.
“This isn’t a fresh eye. They have already published their results, and spending all this time and money is not going to help anyone. I am quite certain they’ll come to the same conclusion.”
An official with Mr. Kennedy’s Department of Health and Human Services declined to comment. Two White House spokesmen did not respond to a request for comment. David Geier did not reply to emails or calls requesting comment.
Mary Holland, chief executive of Children’s Health Defense, the anti-vaccine nonprofit Mr. Kennedy ran until his presidential bid, praised David Geier on its website on Wednesday, describing him as “a brilliant, extremely knowledgeable researcher with deep expertise on mercury.”
(Over the weekend, federal officials ordered the nonprofit to remove a mock C.D.C. web page suggesting a link between vaccines and autism.)
David Geier is listed in the Department of Health and Human Services directory as a “senior data analyst.” News of his role in the agency was initially reported by The Washington Post.
Earlier this month, federal officials announced plans for a large study to re-examine whether there was a connection between vaccines and autism. Mr. Trump has voiced support for H.H.S. officials who wanted to revisit the issue, citing increases in autism diagnoses in children over the decades.
About 1 in 36 children have an autism diagnosis, according to C.D.C. data collected in 11 states, compared with 1 in 150 children in 2000.
Many scientists believe the rise is due in part to increased awareness of the disorder and changes in how it is diagnosed by medical professionals, though genetic and environmental factors could be playing a role as well.
The Senate confirmed Mr. Kennedy largely because he won over the chairman of the Senate health committee, Bill Cassidy, Republican of Louisiana, who is a medical doctor and strong proponent of childhood vaccines.
Mr. Cassidy has said that further research into any supposed link between vaccines and autism would be a waste of money and a distraction from studies that might shed light on the “true reason” for the rise in autism rates.
On Thursday, Mr. Cassidy said he wanted confirmation of David Geier’s role, aside from news reports. He mentioned that he had breakfast with Mr. Kennedy on Thursday but said the topic did not come up.
At one of his confirmation hearings, Mr. Kennedy shot back at Mr. Cassidy, citing a study from an ecosystem of vaccine critics that he said proved a connection between vaccines and autism.
David Geier comes from a similar circle of researchers. Along with his father, he played a formative role in Mr. Kennedy’s thinking.
Mr. Kennedy interviewed David Geier for an essay in 2005, “Tobacco Science and the Thimerosal Scandal,” in which he accused the C.D.C. of deliberately hiding vaccine data, under chapter headings like “Conspiracy” and “The Cover-Up.”
Mr. Kennedy described the Geiers’ belief that thimerosal, a mercury-containing preservative used in some vaccines, was linked to childhood autism. The preservative has since been removed from most childhood vaccines but is still used in some flu shots.
In a Rolling Stone article called “Deadly Immunity,” Mr. Kennedy credited the Geiers with being among the few who had gained access to C.D.C. vaccine data, which he said they used to “demonstrate a powerful correlation between thimerosal and neurological damage in children.” (The magazine later withdrew the article, but did not elaborate.)
Almost a decade later, in Mr. Kennedy’s book, “Thimerosal: Let The Science Speak,” he paid homage to the Geiers, mentioning them nearly 250 times. He called them a “father-and-son team of independent medical researchers” who had “published extensively on the topic of thimerosal and its potential link to neurodevelopmental disorders, particularly autism.”
Mr. Kennedy acknowledged that the two had become “lightning rods of controversy in the vaccine safety debate.”
“The Geiers have published no fewer than thirteen epidemiological studies of the associations between Thimerosal and health effects in U.S. populations, employing accepted statistical practices,” Mr. Kennedy wrote in the book.
On a podcast in 2022, Mr. Kennedy credited the Geiers’ research for showing that vaccines “had nothing to do with” a decline in infectious diseases over decades. “It was all an illusion,” Mr. Kennedy said, attributing the decrease to improving sanitation and nutrition.
The Geiers’ work has been repeatedly discredited by other scientists and federal court decisions.
An extensive review of the purported link between vaccines and autism in 2004 by the Institute of Medicine, an elite group of doctors and researchers, panned the Geiers’ studies. The review found their work to be marred by flaws “making their results uninterpretable.”
The institute’s report on a connection with the measles shots said: “The committee concludes that the evidence favor rejection of a causal relationship between M.M.R. vaccine and autism.”
In 2011, the Maryland Medical Board accused David Geier of practicing medicine without a license alongside his father at a Rockville, Md., clinic for children with autism.
One mother of a 10-year-old boy with autism balked when David Geier reportedly ordered 24 different blood tests for her son.
His father, Mark Geier, lost his medical license in 2012. Records in that case indicate that both father and son promoted a theory that thimerosal caused autism.
State authorities found that the Geiers had offered treatment with puberty-blocking drugs. To some patients, they offered chelation, a procedure to remove heavy metals from the blood, records show. David Geier was assessed a $10,000 fine.
Judges have rejected the Geiers’ efforts to serve as experts on vaccine safety in court. Records show that judges challenged the father-son team’s billings for hundreds of thousands of dollars related to services they provided as experts for a specialized vaccine injury court.
The judges cited David Geier’s lack of qualifications, which include a bachelor’s degree in biology, and raised concerns about his father’s credibility.
Judge George L. Hastings Jr. said in 2016 that David Geier was not qualified to render an expert opinion in a National Vaccine Injury Compensation court case.
Judge Hastings said his report “is neither useful nor relevant, because he is not qualified as an expert concerning the matters he discusses.”
In a review of two Geier studies this week, Jeffrey S. Morris, director of the division of biostatistics at the University of Pennsylvania, said he found what appeared to be a numerical sleight of hand that made it appear that vaccines caused a spike in autism.
“When I look at these two studies, they are so fatally flawed that I have serious concerns that any study that they’re going to design is going” to be rigorous enough, he said, “to yield valid results.”
To Mr. Hunter, formerly of the C.D.C., the decision to spend federal funds on a new study of a debunked theory would come at the cost of a meaningful discovery.
Since he became health secretary, Mr. Kennedy has presided over cutbacks involving research into nearly every aspect of health care and diseases. On Thursday, he announced a massive reorganization and reduction in the work force from 82,000 to 62,000.
“To me, the big shame is that with budget cuts, we are not ramping up research into what is actually causing autism,” Mr. Hunter said. “And if you are worried about vaccine-preventable disease, this is such a clear setback.”
Michael Gold contributed reporting from Washington. Alain Delaquérière contributed research. Jeremy Singer-Vine provided data analysis.
Science
Video: Southern Lights Seen From International Space Station
new video loaded: Southern Lights Seen From International Space Station
By Cynthia Silva
June 10, 2026
Science
UC Davis favored less qualified Black, Latino med school applicants, Justice Department claims
The U.S. Justice Department has accused the UC Davis School of Medicine of choosing race “over merit, skill, and competence” in its admissions process, favoring Black and Latino students even when they weren’t as qualified as white and Asian applicants.
The department said its findings, announced Wednesday afternoon, were based on a six-month investigation by its Civil Rights Division. The Justice Department said it found that the Northern California university violated the Supreme Court’s 2023 ruling against race-based determinations in admissions. The findings have been contested by the school.
“Davis Med’s actions reflect both unabashed contempt for the rule of law and plain disregard for the potential public health consequences of putting race over merit, skill, and competence,” Assistant Atty. Gen. Harmeet K. Dhillon of the Justice Department’s Civil Rights Division said in a statement.
“The Department will not allow schools to violate federal law without consequence.”
A spokesperson said the university was “disappointed” with the report and its findings.
“UC Davis School of Medicine strongly disagrees with any characterization of its admissions practices as discriminatory or inconsistent with applicable law,” a school statement read. “The report’s findings do not accurately reflect the school’s rigorous, individualized, and merit-based admissions process and our firm commitment to complying with applicable federal and state antidiscrimination laws.”
The department outlined its case in a 12-page letter to an attorney representing UC Davis, claiming the university violated Title VI of the Civil Rights Act, as interpreted by the Supreme Court’s 2023 Students for Fair Admissions vs. Harvard.
Title VI prohibits institutions receiving federal funding from discriminating based on race, while the 2023 decision banned affirmative action in higher-education admissions.
The Justice Department said its investigation found the medical school “adopted admissions practices with the express purpose of circumventing” the 2023 ruling.
That method was the “Davis Scale,” the department said. The letter called the scale a “continuous measure of socioeconomic disadvantage” that includes parental income and education, growing up in a medically underserved area and other socioeconomic variables.
The Justice Department included UC Davis literature that said the scale had allowed the school to triple the enrollment of Black and Latino students.
In 2024, Davis’ medical school became the third most racially diverse medical school in the country, the Justice Department claimed.
Conversely, the department said its review of medical school admissions data from 2023 to 2025 found that 93% of white and certain Asian applicants had MCAT scores at or above those of the average Black student.
It also showed that Black and Hispanic applicants were admitted at rates up to six times higher than whites and Asians, despite consistently having, on average, lower academic qualifications, according to the department.
The Justice Department said it is attempting to enter into a voluntary agreement with UC Davis to bring the medical school into compliance. The department would eventually sue the medical school if such a resolution is not found.
UC Davis did not indicate whether it would comply with the Justice Department.
“UC Davis is fully committed to meeting the critical healthcare needs of California, particularly those in underserved and under-resourced areas,” the school said in a statement.
The finding mirrors similar investigations into medical schools at UCLA and UC San Diego.
The Justice Department said last month that UCLA’s David Geffen School of Medicine intentionally used race for the last three years to discriminate against white and Asian applicants during admissions.
Science
Why new dads shouldn’t panic about low testosterone
Three months after his son was born, Kevin Maguire felt alone.
It was 2019. He had recently moved to Barcelona with his wife and daughter and was working on marketing projects for Fortune 500 companies. The birth of his son, Bodhi, should have been a joyous event. But Maguire, now 43, became sad and irritable, and didn’t want to be around his newborn. He withdrew from family and friends, often playing video games late into the night or finding excuses to get out of the house.
“I would take the dog out for a walk,” Maguire said. “I wanted to get far away enough that I wouldn’t bump into anyone I knew and I would just sit and cry.”
Desperate for answers, he entered his symptoms online. Maguire, author of the recently published book “The New Fatherhood: Why Everything They Told You About Being a Dad Is Wrong, and How Embracing It Will Transform Your Life,” knew to look for signs of the “baby blues” in his wife. But he was surprised by articles that said men could experience postpartum depression too. The diagnosis resonated and he began writing about his condition and the trials of fatherhood on Substack.
New dads face psychological pressures, from sleepless nights to sky-high bills, which can contribute to postpartum depression. So can shifting hormone levels.
“One thing I found in my lab’s research is that when new dads have really low levels of testosterone, they might report more symptoms of postpartum depression,” said Darby Saxbe, a professor of psychology at USC and author of the recently published “Dad Brain: The New Science of Fatherhood and How It Shapes Men’s Lives.”
While hormonal shifts can create challenges, they also help men adapt to fatherhood, Saxbe explained. Several hormones can spike in men when they become dads, including oxytocin, linked to better relationship quality; vasopressin, associated with emotional bonding; and prolactin, which promotes lactation in women and caregiving behavior in guys.
New dads can also experience a decline in testosterone. According to a 2011 paper from University of Notre Dame professor Lee Gettler, part of the largest study on fatherhood and testosterone ever conducted, men averaged around a 25% drop in testosterone after becoming fathers.
While dads have reasons to be concerned by plummeting levels of testosterone, a modest dip isn’t necessarily a disaster — in fact, it can make men better parents and partners.
“We often get invested in the idea that men should always have the highest possible levels of testosterone,” Saxbe said. “What the research tells us is a little more nuanced. You really want flexibility. You want a hormonal system that can adapt to the different demands of your life.”
The prospect of a decline might scare soon-to-be fathers, especially those on TikTok and Instagram, where accounts push the idea that having “high T” is the key to being a “real man,” according to a recent study in the journal Social Science & Medicine.
Influencers stand to profit persuading men there’s a widespread “masculinity crisis,” the researchers found, noting that 72% of the accounts they analyzed had a stake in testosterone supplements and treatments.
But studies show more testosterone isn’t always better. “We found that when dads have higher testosterone, even before birth, they’re less invested [than men with lower testosterone] in co-parenting a few months after birth,” Saxbe said. High T fathers were more stressed from parenting than their lower T counterparts, and had partners who were less satisfied in their romantic relationships.
This jibes with the challenge hypothesis, which says, in multiple species, testosterone levels rise when males battle for attention from potential mates and go down when it’s time to take care of the young.
While a small decline can be adaptive, dads face mental health risks when their testosterone drops too low.
There is no “normal” level of testosterone, said Dr. Jesse Mills, director of the Men’s Clinic at UCLA Health. Experts recommend that men should consider treatment if their levels dip below 300 nanograms per deciliter (ng/dL). But men metabolize testosterone in different ways, meaning a healthy level for one might be low for another.
“If a new dad comes to me and his testosterone is 298 [ng/dL], he’s below the threshold,” Mills said. “But if he has zero symptoms and everything else is going great — he’s over the moon with his new child, he’s so happy — that’s not somebody I’m going to treat with testosterone.”
He notes that the drop in testosterone fathers experience can partly be attributed to the stresses that come with a new kid: less sleep, a poor diet and fewer trips to the gym. That means there are precautions that expectant fathers can take that don’t involve testosterone replacement therapy (TRT).
Still, while some guys with low testosterone levels might not need TRT, others in the “normal” range could benefit from treatment. (Dads who want another kid soon, beware. Mills notes that testosterone replacement therapy can take a man’s sperm count to zero.)
Both Mills and Saxbe stress that men should be paying attention to symptoms of low testosterone — such as depression and low libido — rather than trying to reach or maintain an ideal number. They also agree that tending to mental health concerns is hugely important for new fathers.
Eventually, after Maguire researched his condition, he recovered after time spent meditating, exercising and bonding with his son.
“A lot of new dads don’t realize how much they’re struggling because they feel ashamed or because they don’t realize it’s common shortly after the birth of a baby,” Saxbe said.
When they struggle, fathers can fixate on testosterone because that’s what modern culture tells them will make them feel better. And sometimes testosterone replacement therapy works. But Saxbe stresses a lot of men could use psychotherapy or support groups that bring dads together, as well as more time bonding with loved ones in general.
“The thing that predicts a man’s well-being and longevity is the quality of his relationships with other people,” said Saxbe. “You can be the world’s best weightlifter. You can have a low body-fat percentage. You can be killing it at work. Those things don’t predict how happy you’re going to be at 80.”
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