Mark Epstein

Mark Epstein, born July 14, 1954, is the younger brother of the late financier Jeffrey Epstein. He is a property developer and real estate investor who co-founded the firm Ossa Properties and became a general partner of the venture Dara Partners in the early 1990s, alongside other business interests. His relationship to Jeffrey Epstein is familial: reference sources identify him simply as Jeffrey Epstein’s brother. Mark Epstein has publicly characterized the relationship as primarily familial and, with respect to property, as landlord and tenant. In 2019 he told The Real Deal, “Other than the obvious relationship of being brothers, the only other relationship between Jeffrey and I is as landlord/tenant.”

The brothers were connected in public reporting through a Manhattan condominium building at 301 East 66th Street, which Ossa Properties — described by The Real Deal as a former affiliate of Jeffrey Epstein’s J. Epstein & Co. — acquired in the early 1990s. Mark Epstein has acknowledged that Jeffrey used some units in that building but has said he did not monitor who used the apartments. Being related to or doing business with Jeffrey Epstein is not, by itself, evidence of wrongdoing, and the materials reviewed for this profile do not contain allegations of wrongdoing against Mark Epstein.

Mark Epstein is best known publicly for questioning the official account of his brother’s death. Jeffrey Epstein was found dead in a federal jail cell on August 10, 2019; the New York City Chief Medical Examiner ruled the death a suicide by hanging, a conclusion supported by the FBI and, in June 2023, affirmed by the U.S. Department of Justice Inspector General after a review that interviewed dozens of witnesses and reviewed roughly 100,000 documents. Mark Epstein has publicly rejected the suicide finding, saying the death “looks more like a homicide” and calling for the investigation to be reopened.

He has continued to raise these doubts in interviews. Newsweek reported that in July 2025 Mark Epstein gave an interview to the BBC program Newsnight, where he argued that his brother did not take his own life in jail in 2019, and that he repeated those doubts in a separate interview with Al Arabiya English. In the same Newsweek account, Mark Epstein described his last conversation with his brother as occurring the night before Jeffrey Epstein’s July 2019 arrest, calling it “just a normal brother-to-brother you know ‘what’s new?’ kind of telephone call and he was fine,” and said, “I did not speak to Jeffrey after he was arrested. While he was in jail, I didn’t speak to him.” These official rulings stand notwithstanding his public statements, and the sources reviewed here do not establish that his doubts have changed the formal cause-of-death determination.

Is Mark Epstein in the Epstein files?

In reporting on the people named in the Epstein files, Mark Epstein is not listed as a named individual in the main compilation. He appears only in an index of personal connections, where he is identified simply as Jeffrey Epstein’s brother, and is otherwise referenced in another person’s entry only in connection with the Manhattan building owned by him and managed by his brother. He is not described there as a client, associate, or participant in the conduct at the center of the Epstein investigations. His public relevance derives from his family relationship to Jeffrey Epstein and from his role as a vocal critic of the official conclusion that his brother died by suicide, as described in the sources above. The materials reviewed for this profile do not contain allegations of wrongdoing against Mark Epstein.