Until recently, Massachusetts Institute of Technology professor Kristin Knouse was regarded as a prominent biologist in a male-dominated field and a high-profile advocate of the #MeToo movement.
Her reputation has since suffered a dramatic reversal following a false rape allegation that nearly destroyed the career of one of the world’s leading cancer researchers.
Knouse, 38, defamed Professor David Sabatini after their casual, consensual relationship ended when he decided to pursue another woman.
It took five years for the 58-year-old scientist to clear his name.
During that time, Sabatini watched colleagues rally behind Knouse as his career and reputation unraveled in full public view.
MIT removed Sabatini from his position in 2021 based on Knouse’s allegations, turning him into an outcast in the scientific community despite his insistence that he had done nothing wrong.
His vindication came only this fall, after he used Knouse’s own text messages in a defamation trial to challenge her account.
Sabatini won the civil case and was awarded $9.6 million after jurors concluded that Knouse had caused severe emotional, financial and reputational harm.
Knouse intends to appeal. For now, however, she is facing the kind of reputational collapse that Sabatini says she inflicted on him.
Kristin Knouse, a researcher at the Massachusetts Institute of Technology, falsely claimed that a prominent professor she worked with had sexually assaulted her
Knouse is pictured with Professor David Sabatini. They had a consensual relationship, but after he ended it, she launched what he described as a campaign against him
Despite winning the lawsuit, Sabatini says he remains deeply traumatized. Speaking to the Daily Mail from his new home in Prague earlier this week, he said Knouse had “completely destroyed my life.”
At his lowest point, Sabatini attempted to hang himself.
Knouse is now facing her own public disgrace.
Jurors reviewed a series of explicit messages, including one in which Knouse wrote that she wanted to “feel like” she “had been gang raped.” The messages were presented as evidence that she and Sabatini had been involved in a casual sexual relationship for roughly a year.
The evidence also challenged the account Knouse had maintained for years: that she, rather than Sabatini, had pursued the relationship.
After Sabatini chose to date another woman, Knouse texted a friend about plans to get him “Weinstein-ed out of science,” invoking disgraced Hollywood producer Harvey Weinstein.
Video obtained by the Daily Mail shows Knouse’s version of events being challenged during a deposition.
Sabatini’s attorney, Lisa Arrowood, read the messages aloud, including one that said: “I can’t wait to wake up tomorrow and feel like I’ve been gang raped.”
Arrowood then asked Knouse what she meant by the message.
Kristin Knouse is pictured working at MIT. The biologist remains employed by the university despite the allegations that damaged the reputation of a leading cancer researcher
Knouse appears in a videotaped deposition, where she was questioned about messages that undermined her claims of sexual assault against Sabatini
Sabatini told the Daily Mail that he attempted to hang himself at his lowest point and still feels like a shadow of his former self
“We had been at the gym earlier and had done a bunch of squats,” the MIT professor replied. “I was referring to the fact that I’m looking forward to feeling sore from being at the gym.”
The remark became part of the evidence supporting Sabatini’s case.
Arrowood suggested that Knouse had told Sabatini she “really liked sex to be hard,” based on the messages.
Knouse initially resisted, saying, “I would have to see the cases in which I said that.”
“I’m asking you, did you say it?” Arrowood responded. Knouse then conceded: “I imagine that I would say that I was open to more, rougher, sex.”
Knouse was also confronted with messages showing that she had repeatedly pursued Sabatini for sex, including a text sent at 1:30 a.m. after a Whitehead Institute retreat at a hotel in New Hampshire.
She had previously alleged that Sabatini made her feel “very nervous and scared” at the retreat by asking her multiple times to have sex.
That claim conflicted with messages in which she acknowledged aggressively pursuing him for sex at the hotel.
Knouse is pictured at a December 2025 hearing after Sabatini sued her for defamation. He won the civil case, and she was ordered to pay him $9.6 million
Knouse, pictured at MIT, remains employed by the prestigious university despite the controversy surrounding the case
Her account suffered another setback when therapy notes were introduced in court. The records indicated that she had described the nature of their relationship differently in private sessions.
According to the notes, Knouse told her therapist that she wanted to continue receiving “validation from such a powerful figure in my career” when she began her casual relationship with Sabatini, who was then considered a potential Nobel Prize candidate.
“My pursuit of obtaining an unavailable man is the ultimate validation of my perfection,” Knouse wrote in notes later admitted as evidence in the defamation trial.
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Messages sent to friends also showed Knouse celebrating as Sabatini, whose cancer research had earned him 10 international awards, saw his career collapse.
In May 2021, she told one friend that she had been “a victim of egregious sexual misconduct by Sabatini,” adding: “I think he will get fired… f***ing Weinstein his ass.”
After the friend offered support, Knouse wrote: “My lawyers and I are out for blood… prison is what he should get.”
After Sabatini was described as a sexual predator in the Boston Globe and other publications, Knouse wrote that he had been “hopelessly defeated, beyond the violence stage.”
Speaking from his new laboratory in Prague, Sabatini said the messages celebrating his downfall were difficult to read.
Sabatini is pictured with boxes containing his work after he was removed from the Massachusetts Institute of Technology
“There is a very strong strain of maliciousness which is very hard for me to read now, given that we were together,” he said.
Sabatini said he now believes Knouse began plotting against him after he told her in January 2021 that he wanted to pursue a relationship with another scientist.
He said the woman, whom he later married, was living in Germany. Knouse initially believed the pandemic had ended their relationship.
But after learning that he had bought a flight to Germany to visit her in October 2020, Knouse “went nuclear,” Sabatini said. She subsequently reported him to the Whitehead Institute for alleged sexual harassment.
Sabatini said he was blindsided by the campaign, claiming Knouse spent months quietly preparing her allegations and persuading members of her lab to support her.
He said the accusations quickly spread on Twitter, where members of the #MeToo movement joined the criticism before he had an opportunity to respond.
Over the following months, Sabatini watched the career he had built over 25 years collapse.
MIT President Sally Kornbluth has not commented publicly on Sabatini’s removal from his position
The Massachusetts Institute of Technology is pictured. Staff members turned against Professor David Sabatini after he was accused of sexual assault
He lost positions at both the Whitehead Institute and MIT. An online backlash involving students and faculty at New York University also blocked a job he had been discussing with professors there.
His name was removed from prominent scientific papers, and he was booed out of auditoriums where he had once been a celebrated speaker.
Although he welcomed the court’s verdict, Sabatini said the ruling could not restore his former life.
His marriage to the woman he chose to pursue instead of Knouse has ended, and he moved across the world to escape the intense public backlash.
“This has completely destroyed me and completely changed my life,” Sabatini told the Daily Mail. “Nothing that remained from before is still operating. Everything is gone.”
During the darkest period, when he said he had been forced into hiding, Sabatini attempted to take his own life by hanging himself at home.
“I fell into an extremely deep depression, something I had never had before,” he said.
“I stopped eating, lost a lot of my hair, pretty much stopped talking. Family birthday parties were still happening. What everyone noted about me was that I was catatonic.
“It was very strange to be the big raincloud of other people’s moments when you’re supposed to be happy, so I felt doubly bad about that.”
Before the allegations upended his career, Sabatini had been a major figure in the scientific community.
He had received 10 international awards for breakthroughs in cancer research and was considered a strong potential Nobel Prize candidate.
The Sabatini Lab at MIT brought together 46 cellular research scientists, including seven who later established laboratories at Harvard.
Asked whether potentially lifesaving research had been delayed by the controversy, Sabatini replied: “Certainly. The work I was doing, that was all destroyed.”
“We were working on many different diseases, including cancer but also many different degenerative diseases, so that was all lost, and frankly I don’t even know what happened to that work.
“But the world is large, and you never know where treatments are going to come from. If it were to come from us, it certainly got held back.”
A judge dismissed Sabatini’s claims against MIT and Whitehead Institute President Ruth Lehmann.
Knouse, meanwhile, has kept her position at MIT.
An MIT spokesperson said: “The Board of Directors of Whitehead Institute has full confidence in the leadership of Director Ruth Lehmann, the Institute’s workplace policies and the process that included the 2021 investigation into Sabatini’s lab, which was conducted by an independent law firm.
“Whitehead Institute was not a party to the lawsuit between David Sabatini and Kristin Knouse in which a jury verdict was announced Oct. 16, 2026.
“All claims made by Sabatini against Whitehead had previously been dismissed by the Court.”
The Daily Mail has contacted Knouse’s lawyers for comment.