Epstein's scattered business track record has made it difficult to pin down his primary source of wealth. He headed Atelier Enterprises, Inc., a charter and leasing company, in 1984 before he began investing in New York real estate in the early 1990s.
Records reported by the Daily Beast show Mark Epstein formed his own modeling agency, Saint Model and Talent, in December 2005, but the report notes that the agency has no website or social media presence and does not appear to have ever signed a model.
His business ventures reportedly came alongside financial trouble. While plagued with recurring tax debt, Epstein tried unsuccessfully to sell his 80-foot, 3 1/2-bathoom yacht, according to The Wall Street Journal.
His wealth has been the subject of scrutiny for years, as he previously claimed to have semi-retired at age 39 and donated hundreds of thousands of dollars to charity. He has also repeatedly denied any business connections to Jeffrey, but his past deals are likely ripe for probing by federal investigators in Jeffrey's conspiracy case.