Former MIT Scientist Wins $6 Million Defamation Verdict Against Sexual Misconduct Accuser

Former MIT scientist David Sabatini won a $6 million defamation verdict against a former colleague who accused him of sexual misconduct, after a Massachusetts jury rejected her claims of sexual harassment and retaliation. The October 16, 2026, decision followed a five-year legal battle that began when the allegations derailed the prominent biologist's research career.

Jurors in Suffolk County Superior Court in Boston found that Kristin Knouse, now an MIT biology professor, defamed Sabatini by describing him as a sexual predator and interfered with his professional relationships. The jury ordered her to pay $6 million plus interest, marking a major legal victory for the scientist following his departure from the Whitehead Institute for Biomedical Research in Cambridge, Massachusetts.

Sabatini, whose research into cellular growth helped advance the study of cancer and aging, lost his position at Whitehead in 2021 after an investigation into allegations of workplace misconduct. The institute found that he violated policies governing sexual relationships and harassment, prompting his resignation. MIT placed him on leave, while the Howard Hughes Medical Institute terminated his employment over violations of its workplace policies.

The investigation followed allegations by Knouse, a former graduate student and researcher whom Sabatini had mentored. She claimed he used his professional influence to pressure her into a sexual relationship and fostered a hostile, sexualized workplace environment. According to Knouse, the imbalance of power made it difficult to end the relationship.

Sabatini maintained that their relationship, which began in 2018, was consensual. He accused Knouse of making false statements that damaged his reputation and prevented him from securing another academic position.

On October 20, 2021, Sabatini sued Knouse, Whitehead, and institute director Ruth Lehmann, alleging defamation and other wrongdoing. Whitehead and Lehmann were subsequently dismissed from the litigation, leaving the former colleagues to pursue their competing claims against each other.

The dispute reached Massachusetts' highest court before returning to a jury.

On May 19, 2026, the Massachusetts Supreme Judicial Court revived Knouse's sexual harassment counterclaim, ruling that state law permits people alleging harassment in academic settings to sue the individuals accused of misconduct directly. The decision allowed her allegations to proceed to trial, where jurors ultimately ruled against her.

The ruling established that Massachusetts' sexual harassment statute extends to individual defendants in academic settings, potentially affecting other disputes involving professors, advisers, and students. The court addressed who could face liability under the law, leaving the merits of Knouse's allegations to the trial court.

Whitehead, which had been dismissed from the lawsuit, said the verdict concerned Sabatini and Knouse rather than the institute. Its earlier findings of workplace policy violations remain unchanged.

Following the verdict, Sabatini's attorney, Lisa Arrowood, celebrated the outcome, saying the decision restored her client's reputation after years of professional turmoil. Sabatini had struggled to continue his research career after leaving MIT and Whitehead, despite his earlier scientific achievements.

Knouse's attorney, Ellen Zucker, criticized the decision and maintained that her client had told the truth about her experiences. She pointed to testimony from other women about conditions in Sabatini's laboratory and raised concerns about the difficulties women face when reporting misconduct involving powerful colleagues.

Zucker said Knouse intends to appeal the verdict, potentially returning the dispute to Massachusetts appellate courts after five years of litigation.