Since retiring after a playing career spanning fifteen years, he went on to work as a broadcaster for Sky Network Television and as a presenter on Maori TV sports show, Hyundai Code.

In 2010 he coached his schoolboy club Point Chevalier Pirates in the Auckland Rugby League's Phelan Shield alongside former team mate and childhood friend Stacey Jones.

He was an integral part of the 2002 New Zealand Warriors squad, noted for being the first team in the club's history to make the NRL Grand Final.

[3] Guttenbeil was chased by several professional clubs after an Auckland Development Tour of Australia in 1993 and ended up moving to Sydney at the age of 17 to sign for the Manly-Warringah Sea Eagles under the then Australian coach, Bob Fulton.

Guttenbeil was set to star for Manly but his decision to sign with the yet to be formed Super League competition saw him out of favour with the club and so he returned to New Zealand to play for the Auckland Warriors in 1996.

Guttenbeil played at second-row forward in the Warriors' 2002 NRL Grand Final loss to the Sydney Roosters.

[10] In 2010 a prankster posing as Wairangi Koopu led to news articles claiming that Guttenbeil was joining the AMNRL.