In 2026, it was reported that Lang had a personal relationship with Epstein for several years (between 2012 and 2019), and borrowed Epstein's vehicles for his family's use. In an exchange dated January 28, 2013, in response to a document sent by Jack Lang entitled “Petit Prince,” Epstein asks whether "the child should be introduced to religion. new sexuialitys, tested ? how often, standardized tests. sample projects. etc..” In an email dated January 30, 2013, Caroline Lang replied: "My father agrees with your suggestion on adding religion, new sexuality, etc. (…) I think it would be easier for him to talk to you in person when you come over next to Paris."

“I fully accept the ties I may have formed at a time when nothing suggested that Jeffrey Epstein could be at the heart of a criminal network,” he said in a statement. “Had I known, I would have immediately cut off all contact with him.”

He was president of the Arab World Institute in Paris from 2013 until his resignation in 2026