Berenson O'Neil is a law firm headquartered in New York, mentioned in episode "The Choice".
Arnie Berenson, managing partner, offered Louis a significiant position in his firm druing their secret meeting in a cafe. Next morning, Louis was about to tell Jessica about his consideration working for Berenson O'neill firm when Paul Porter interrupted them. After he received a gift from Daniel Hardman, he made his mind and stayed in Pearson Hardman.
- Arnie Berenson – managing partner
- O'Neil – managing partner (however, was never mentioned or seen)