How Millie the Dog Launched My Career in Lead Poisoning Prevention

In the world of disease detectives, the archetype is well known: the CDC shoe-leather epidemiologist chasing the source of an outbreak, armed with a computer and an unrelenting curiosity. But there is another type of detective who chases quieter, slower epidemics—those that unfold over years, affect millions, and leave no dramatic fevers or rashes in their wake. These are the environmental epidemiologists, and this is the story of how I became one.

It started with a dog.

Not just any dog, but Millie, the beloved Springer Spaniel of President George H.W. Bush and First Lady Barbara Bush. In 1990, Millie was poisoned during a White House renovation—not by a foreign adversary or a political rival, but by lead dust. Her illness made the front page of the Washington Post, complete with a photo of the distraught First Couple and their equally distressed dog.

That same week, Representative Louis Stokes, a longtime champion of public health, sent a message to the President: “Mr. President, while I wish Millie a speedy recovery, did you know that 3 to 4 million American children are poisoned by lead every year?”

Suddenly, lead poisoning wasn’t just an abstract urban problem. It was personal, presidential even. And the outrage sparked action. In 1992, Congress passed the Lead-Based Paint Hazard Reduction Act, which directed the U.S. Environmental Protection Agency (EPA) to establish a standard for dangerous levels of lead dust in homes. It was a mandate with teeth. And it landed, quite unexpectedly, in my lap.

I worked with experts at the CDC, HUD, and the National Center for Lead-Safe Housing to conduct a large-scale study that would determine what levels of lead dust posed a risk to children. This wasn’t just another academic exercise. For the first time, we had the chance to identify lead hazards in homes before a child was poisoned. That was revolutionary.

On July 1, 1995, the study was funded, but we need approval from the Office of Management and Budget. We submitted our proposal, and to our surprise, got approval from the OMB in just two weeks—a record at the time. The quick green light wasn’t just bureaucratic luck; it was a sign that the Clinton administration was genuinely committed to understanding the true dangers of lead exposure. By August 15—just six weeks later—we were in the field with a 30-person team.

I was exhilarated—and terrified. The timeline was brutally short. I spent more than a few sleepless nights wondering how we would ever complete it on time. The inclusion criteria alone were daunting: children between 12 and 30 months of age, living in the city of Rochester, in the same home since they were 6 months old, with no prior history of lead poisoning, and whose parents had no occupational or hobby-related exposure to lead. We also had to finish data collection by Thanksgiving—in 100 days!

And then, colleagues told me we needed enroll a random sample of children.

At the time, that sounded nearly impossible. But in the end, it turned out to be the key because we actively sought out eligible families rather than wait for them to show up at a clinic. We compiled a list of over 2,500 children born in Rochester during our target window, randomly permuted the list, and hired three staffers to call every family on it—up to six times—until we found 205 eligible children.

Once we had them, the real work began. We collected 36 dust samples with two vacuum samplers and a wipe sampler from each home, 12 to 16 soil samples, two water samples, blood samples from the children, and a two-hour interview with each family. This was not a study for the faint of heart.

The science behind our study was built on the shoulders of others. Two pediatricians, Jim Sayers and Evan Charney, helped revolutionize our understanding of lead exposure in children. While others were focused on peeling paint chips, they looked closer—literally. When taking capillary blood samples from children, they noticed high concentrations of lead on the children's finger pads. They showed that children with lead poisoning also had high levels of lead in their house dust. It was a key insight: dust, not just paint chips, was poisoning children.

And the results were clear. We found that floor dust lead levels between 5 and 10 micrograms per square foot—levels far below what anyone considered dangerous at the time—led to an increase in the risk of lead poisoning. Despite this, the EPA set the hazard standard at 40 micrograms per square foot.

At that level, our data showed that 1 in 5 children would be lead poisoned. That should have been a wake-up call. Instead, it became a case study in how public health decisions are made: not based on the best available science, but on what seems feasible or politically expedient. Feasibility trumped science, and children paid the price.

I spent the next decade showing that lower levels—below 5 micrograms per square foot—were not only safer but achievable. Time and again, our follow-up research demonstrated that these lower thresholds could be met through practical, cost-effective measures. The science was solid. But still, policy lagged.

I wasn’t alone. Parents, physicians, scientists, and advocates played a vital role in keeping pressure on policymakers and insisting that children deserved better protection. Without their tireless efforts, the slow machinery of regulation might have stalled altogether.

In 2009, the Sierra Club and other advocacy groups petitioned the EPA to revise the standard. The agency agreed but failed to act by 2016.

Enter Earthjustice. They sued the EPA in federal court. The judges ruled: the EPA must revise the standard.

The EPA complied—but again, the standard fell short of what the science clearly demanded. Earthjustice sued a second time. The courts, once again, sided with the children. This time the judges were explicit: the EPA must base its standard on science alone, without regard to cost.

Finally, on October 24, 2024—35 years after Millie the Dog fell ill—the EPA set a dust lead standard that would have protected children back in 1995.

It felt like vindication. But it also felt too late.

Because since then, we’ve learned something even more sobering: no level of lead exposure is safe. The damage begins at levels so low they’re difficult to measure. And still, the standard remains inadequate. Too many policies continue to treat children as acceptable collateral damage in the name of cost-saving or convenience.

This story reflects how environmental health standards are set—slowly, reactively, and too often only after irreparable harm has been done. It illustrates the enduring problem: standards take far too long to enact, and even when they are enacted, they frequently reflect what is convenient, not what is necessary.

Today, many countries lack even basic regulations for the use of lead-based paints. And some multinational paint companies—like Sherwin-Williams in the United States and Berel in Mexico—continue to sell or export lead-based paints or pigments to low- and middle-income countries. The result? Along with other sources of lead, 1 in 3 children around the world are lead poisoned. A global crisis, largely ignored.

Environmental health doesn’t come with the urgency of an outbreak or the visibility of a cancer diagnosis. It’s quieter. The damage accrues over time. But it is no less real, and no less deadly. And if scientists don’t speak up, who will?

Throughout this journey, I’ve learned that it is often up to independent scientists—and the parents, pediatricians, and advocates who stand beside them—to push for change. Agencies hesitate. Industries resist. But persistent, science-based advocacy—combined with legal pressure and public awareness—can move the dial. The science was clear in 1995. It just took three decades and a lot of sleepless nights to see it take hold.

In the end, it wasn’t a government agency or a university that first shined a spotlight on the dangers of lead dust. It was a dog. Millie wasn’t the first animal to be poisoned by lead, nor was she the first whose poisoning was recognized. But she became the one who brought national attention to a problem that had too long been overlooked and dismissed as something that happened only in "the slums," to "everybody’s children."

Millie’s illness broke through that denial. It cracked open the conversation, making it harder to ignore what pediatricians, parents, and researchers had been trying to say for years. That lead exposure was not only widespread—it was preventable. And preventable harm, once recognized, demands a response.