In the 1950s at a children’s hospital in Philadelphia, pediatrician Dr. Herbert Needleman successfully treated an infant for a case of acute lead poisoning. “You can not go back to that house” he told the child’s mother, knowing that the likely source of the child's poisoning was lead-based paint. “Where am I going to move to? All the houses I can afford are the same age,” she replied.1
In his 2005 interview for Public Health Reports, Standing Up to the Lead Industry: An Interview with Herbert Needleman, Needleman recalls this case as the one which pushed him to study lead:
“I suddenly realized that the issue was not just making diagnoses and treating them. The issue was in the life story of people.”
In the decades that followed, Needleman tested children’s exfoliated baby teeth for lead and found alarming concentrations that indicated chronic exposure.
The Public Health Reports interview, a primary source for information and quotations in this blog, was conducted by Dr. David Rosner and Dr. Gerald Markowitz. Dr. Rosner passed away in May 2026; you can learn more about his pioneering work here.
Dr. Needleman’s novel study
Determining a patient's history of chronic lead exposure is challenging. Data from hair and nail samples may reflect lead in the environment rather than the lead in the body, while blood lead levels only provide a snapshot of recent lead exposure. Inspired by a 1960s paper that measured lead levels in the teeth of children who had experienced lead poisoning, Dr. Needleman decided to collect and test children’s lost teeth first from a hospital, then from Philadelphia schools (in exchange for a silver Kennedy half-dollar).
In the effort to understand the impacts of lead exposures below acute poisoning levels, children at both the high and low ends of the lead level distribution were brought to a children’s hospital for an IQ examination. Additionally, all teachers (unaware of any lead test results) filled out a questionnaire of each child’s distractibility and ability to follow complex directions.
These data revealed a direct relationship between lead level and both maladaptive behavior and decreased IQ. Dr. Needleman’s study was published in 1979 in the New England Journal of Medicine.
Dr. Needleman’s work also revealed a child’s living location to be a key determinant of their lead levels. For example, Philadelphia’s downtown homes were contaminated with lead-based paint, while certain suburbs were contaminated with emissions from a National Lead Company factory. In contrast, many of the homes in Northeast Philadelphia were newer and did not contain lead-based paint.
The demographics of these neighborhoods were also very different. In recalling the stark divide within his results, Needleman said, “I could guess the kids’ race and where they lived” based on their lead levels.
Testing for lead in teeth rather than blood or hair was a novel approach for the time. To use this method, Dr. Needleman had to come up with a baseline dentine lead level with which he could compare his results. This meant continual adjustments of the baseline lead level as additional teeth were acquired and tested. Dr. Needleman was transparent about this shifting baseline from the beginning.
Accusations of scientific misconduct
Despite his candor and commitment to establishing a baseline backed by the most up-to-date data available, the lead industry identified the shift as a flaw in his methods and focused in on it.
In 1991, Needleman was served a legal brief accusing him of scientific misconduct. The charges — brought by a law firm with known affiliation to the Ethyl Corporation of America — were presented to the National Institutes of Health (NIH). NIH then referred the investigation to Needleman’s university.
As the investigation proceeded, Needleman was physically barred from accessing his data and he was not able to review his files without a chaperone. The university held a hearing, in which Dr. Needleman was asked to respond to questions from two psychologists (Dr. Scarr and Dr. Ernhart) whose research conflicted with his.
Confident in the merit of his work, Needleman requested that the Dean open his investigation to the public. Initially, these requests were denied. Through support from both faculty at the university and the petitioning of hundreds of scientists across the country, the hearing was eventually declared open to the public. Ultimately, the investigation committee found there was no scientific misconduct.
In a 1992 New York Times article, Philip Hilts explained that “...the conflict rose to the level of archetypal confrontation over the uses of science because Dr. Ernhart has been supported in her work by the lead industry, which has fought the conclusion that lead is harmful, while Dr. Needleman became an inspiration of the anti-lead legions and testified regularly on behalf of plaintiffs who said they had been harmed by lead.”
Industry intimidation is not new
When compared to more recent stories of industry intimidation (such as Drs. Hayes and Carpenter who discussed their experiences in a CHE webinar), Dr. Needleman’s experience seems to be an early example. However, in Neddleman’s 1992 article “Salem Comes to the National Institutes of Health: Notes From Inside the Crucible of Scientific Integrity,” published in the journal of the American Academy of Pediatrics, he points out that his experience in the 1990s was hardly new, even then:
“Two Australians, A. J. Turner and J. L. Gibson, who first described childhood lead poisoning in Brisbane in 1892, were derogated by industry and by a segment of the medical community. When Randolph Byers, one of the earliest pediatric neurologists, first suggested in 1943 that some school dysfunction might be due to undiagnosed lead toxicity, he was threatened with a million dollar lawsuit by Lead Industries Association. Clair Patterson, the geochemist credited with dating the age of the earth, was publicly vilified as a crank by the industry and had his career threatened when he suggested that civilization had raised everyone’s body lead burdens to 1,000 times that of our ancient ancestors.”
Emerging research areas are strategic pressure points
By 2005, when Needleman was interviewed for Public Health Reports, dozens of papers that confirmed his findings had been published. It is from this context that he reflected on industry motives saying, “If they could discredit my work, the whole thing would collapse or be fundamentally revised. I’m sure that was it… Then all the other work that grew out of it would be discredited.”
It is no longer up for scientific debate that lead can have detrimental effects at low doses. But corporate challenges to scientific integrity remain, as industry actors push back on evidence of health effects of many other chemicals.
Scientific debate is a vital part of the scientific process because it pushes for increased accuracy as methods and technologies develop. It is important to distinguish this kind of debate from industry efforts to manufacture doubt. To learn more, see Stacy Malkan’s guest blog, Attacks on Scientists: Lessons from the Monsanto papers, David Michaels’ book The Triumph of Doubt, and Markowitz and Rosner’s book, Deceit and Denial: The Deadly Politics of Industrial Pollution.
Camille Sytko worked for CHE as a Science Communications Intern. She is a recent graduate of UCLA, where she majored in Environmental Science and minored in Environmental Systems and Society.