Mark Epstein is Jeffrey Epstein’s younger brother. While far less prominent than Jeffrey, he has appeared in the case’s documentary record through his business activities, his role as a witness, and his connection to properties used by Jeffrey.
Background:
Mark Epstein is a New York real estate developer and businessman. He operated Ossa Properties, which managed a number of properties in New York City. He is not a financier of Jeffrey’s profile and maintained a much lower public presence.
Connection to Jeffrey’s activities:
Multiple properties in New York that appear in connection with Jeffrey Epstein’s operation — particularly in relation to housing young women who were brought into the network — were owned or managed by Mark Epstein’s entities. Deposition testimony by victims and witnesses referenced apartments and buildings associated with Ossa Properties.
Legal proceedings:
Mark Epstein was deposed in civil litigation related to his brother’s activities. His depositions addressed what he knew about who occupied properties he managed and whether he had any knowledge of the operation. Transcripts of his depositions have been among the materials requested for unsealing in ongoing litigation.
His position:
Mark Epstein has maintained that he had no knowledge of criminal activity and was not involved in his brother’s trafficking network. He has not been charged with any crime.
After Jeffrey’s death:
Mark Epstein was involved in proceedings related to Jeffrey’s estate, including as a surviving family member relevant to estate administration decisions. He has not made significant public statements about the case.
Significance:
Mark Epstein represents the family and real estate dimension of Jeffrey’s network infrastructure — illustrating that the operation made use of property resources connected to family businesses.