He has also appeared in the first three seasons of the late night series Poker After Dark on NBC .
Greenstein has appeared in each of the first three series of Poker Superstars Invitational Tournament and all seven seasons of the GSN series High Stakes Poker .
Greenstein has also appeared in the first three seasons of the late night series Poker After Dark on NBC .
Greenstein has appeared in each of the first three series of Poker Superstars Invitational Tournament and all seven seasons of the GSN series High Stakes Poker .