[1] Feinstein represented Giuseppe "Juicy Joe" Giudice of the Real Housewives of New Jersey in his false driver's license case.
[2][3][4] Feinstein also represented Ausar Walcott, a former NFL linebacker with the Cleveland Browns, who was charged with attempted murder due to an incident in June 2013 at a bar in Passaic, New Jersey.
Feinstein represented a key recanting witness which led to the reversal of a murder conviction in the case of Rubin "Hurricane" Carter.
[13] Feinstein represented many high-profile organized crime defendants for over forty-five years, including Joseph "Scoops" Licata (one of the defendants in the United States v. Anthony Accetturo case), the longest federal trial in United States history,[14][15] depicted in the Vin Diesel film Find Me Guilty and in the Book, The Boys From New Jersey;[16] reputed organized crime figures Nicodemo Scarfo, Genovese Family Capo regime Angelo Prisco, and Anthony DeVingo, a fearsome, but likeable, hit man for the Genovese Mob in the 1970s and 80s, said to be the inspiration for Paulie Walnuts in The Sopranos.
[17] Feinstein appeared as a legal commentator on television (Court TV; now TruTV) and was often quoted as an expert on criminal law in many publications.