"But I bit off more than I could chew with Parramatta. In saying that, I take a lot of positives out of the experience and it has steeled me for the next part of my journey.
"In some respects it is a case of getting back to basics, and trying to play a key role at a successful club."
Griffin, who mentored the former Kiwi forward as an assistant coach at Melbourne in 2002, said Kearney still had plenty to offer.
"Stephen has won Four Nations and World Cup titles as coach of the Kiwis, and was involved with premiership victories at the Storm," Griffin said. "The fact his experience has been gained outside the history and culture of this club means he brings a new point of view to our coaching department.
"Things didn't work out in his two years at Parramatta, but that's the way it goes in coaching sometimes.
"Steve has a terrific work ethic and is passionate about coaching ... and he has a hunger for success."
- AAP