The Auckland-born forward will join his home-town club from England, where he is in the final season of his three-year Super League deal with the Warrington Wolves.
"Ben is right up among the best forwards in the game right now and he had plenty of clubs trying to sign him," said Warriors recruitment manager Peter O'Sullivan.
"It's a huge signing for us, one we couldn't be happier with. Ben always had enormous potential and has now matured into a total professional. He'll be a real asset to have back in the NRL."
