DNA From Jefferson’s Hair Bolsters Hemings Paternity Case

A covert 15-year investigation led by the Smithsonian Institution has produced what researchers describe as genetic proof that Thomas Jefferson fathered children with Sally Hemings, the enslaved woman he owned at his Monticello plantation. The findings, drawn from a lock of Jefferson’s hair cut the day he died in 1826, add a powerful new strand of evidence to one of the most enduring debates in American history.

The project’s results are detailed in a new book by Smithsonian cultural anthropologist Richard Kurin, History by a Hair: Thomas Jefferson, Sally Hemings & Solving a 200-Year-Old Mystery, and in a scientific paper currently under review for publication, according to NPR. The work also connects the third president to living descendants of Hemings’s two youngest surviving sons.

Two Centuries of Questions

Jefferson, the principal author of the Declaration of Independence, kept more than 600 enslaved people at Monticello, near Charlottesville, Virginia. Allegations that he fathered children with Hemings — who was about 30 years his junior — first surfaced in the late 1700s and early 1800s, embroiling figures from Alexander Hamilton to John Adams and unsettling Jefferson’s own legacy.

“Thomas Jefferson wrote the most famous phrase in American history — ‘All men are created equal’ — and yet, if he bore children with Sally Hemings who were born into slavery, it seemed like a paradox and a contradiction,” Kurin told NPR’s Michel Martin.

Researchers were not the first to turn to genetics. In the late 1990s, pathologist Eugene Foster analyzed Y-chromosome markers from Jefferson family descendants and a descendant of Eston Hemings. That evidence convinced many historians, Kurin said, but skeptics noted it could point to any Jefferson male — a brother, cousin or nephew. The ambiguities left the question open for a generation.

A Lock of Hair, a Genome Assembled

The new effort began in 2011, when Kurin was previewing a Smithsonian documentary about Jefferson’s personal Bible — a volume the president assembled by cutting out and pasting in passages of Jesus’s moral teachings. Searching for traces of blood on the pages, the team instead found three strands of hair. About five years in, they determined those hairs did not belong to Jefferson.

Kurin returned to Monticello and retrieved a richer lock of hair, held in a packet that had not been in the original inventory, labeled as Jefferson’s and said to have been cut the day he died.

“You open up the packet, and here is Thomas Jefferson’s hair, like a nice lock of hair staring in the face — looked very rich and that hair yielded DNA,” Kurin said. “The key to sequencing his DNA.”

The researchers reassembled Jefferson’s genome and compared it with DNA from 13 living people believed to be descendants of Jefferson and Hemings. They found that descendants of Madison and Eston Hemings carry Jefferson’s DNA — and many carry more of it than do his known descendants through his wife, Martha Wayles. The study ran 20,000 simulations of each paternity scenario, including alternatives involving Jefferson’s brother Randolph and Randolph’s sons, and put the odds that Jefferson did not father either Madison or Eston at less than one in 1,000, the New York Post reported.

“We know that there are descendants of Madison Hemings and Eston Hemings that have a whole lot of Thomas Jefferson DNA,” Kurin said. “You actually had Hemings descendants that had more Thomas Jefferson DNA than the known Jefferson descendants.”

Asked whether the findings settle the paternity question, Kurin was direct: “The DNA speaks for itself.”

The researchers could trace descendants of only Hemings’s two youngest surviving sons. Two of her six children died in infancy, and two others — Harriet and Beverly — left Monticello in 1822, passed as white in Washington, D.C., and have no known documented descendants.

Science With Spirits and Skeptics

The project drew on expertise from the cutting edge of ancient and forensic DNA. Kurin enlisted Beth Shapiro, a MacArthur fellow who works with DNA from extinct species, and Richard “Ed” Green, an expert in paleogenomics, both at the University of California, Santa Cruz.

The techniques refined here have since traveled far beyond history. As Shapiro noted, the same tools were later used to help convict the Gilgo Beach serial killer and the Golden State Killer — an unexpected crossover between historical genomics and modern forensic genealogy.

The findings have not been free of friction. A Hemings descendant who gave a DNA sample in 2015 asked to withdraw her participation, frustrated that Kurin’s book was appearing before the related article had been published in a scientific journal. The sample and related data were destroyed, and the analysis was rerun without her.

David Miller, a sixth-generation Jefferson descendant whose mother provided a DNA sample, welcomed the results. “It’s positive the family now hopefully gets the recognition and acknowledgement and acceptance they deserve,” he said.

An Unsettled Chapter

The scientific strength of the findings is significant, but the interpretive debate they touch remains unresolved. Kurin himself acknowledged two competing readings of the relationship: that a woman held in slavery could not consent, or that Hemings, far younger than Jefferson, exercised considerable agency. He declined to frame the Smithsonian as taking a definitive institutional position.

“Other people may have other ideas, and I don’t think there’s necessarily an institution position, but I think it’s compelling. It’s very clear,” Kurin told the New York Post. “This is a topic of interest to the American people. I didn’t invent this question, and it wasn’t invented by the Smithsonian.”

Some caution is warranted: the underlying paper has not yet completed peer review, meaning the analysis has not been formally vetted by a journal. Kurin hopes to make Jefferson’s genome publicly available, which could help others trace obscured family connections.

“They may end up rediscovering a heritage that was obscured,” he said. “This story is not over yet.”

What to Watch

For now, the near one-in-a-thousand odds against Jefferson’s non-paternity — combined with a genome sequenced from the man’s own hair — leave the historical consensus on firmer ground than ever. But the fuller reckoning lies ahead: publication of the peer-reviewed study, the release of Jefferson’s genome, and the ongoing conversation about consent, power and the enslaved people whose stories Monticello is only beginning to fully tell.