He has previously played for Hull Kingston Rovers, the London Broncos, and the Salford Red Devils in the Super League.

He has spent time at Gateshead Thunder in the Championship 1 on dual registration from Hull KR, and at the Wakefield Trinity Wildcats in the Super League on loan from Salford.

[2] In October 2023, working together with former Castleford teammate Bureta Faraimo, Griffin released a children's book titled Harvey Hippo Finds His Talent.

[6] He had been playing in Australia for the Queanbeyan Kangaroos, a feeder team to the Canberra Raiders, and was originally set to sign for Crusaders until they withdrew from Super League.

In July 2014, shortly after London's relegation from Super League was mathematically confirmed, Griffin signed a one-year deal to join the Salford Red Devils for 2015.

[24] Griffin played 21 games for Castleford in the Super League XXVIII season as the club finished 11th on the table narrowly avoiding relegation.