He is known for The Son of a Gunn Show, What Now, Dancing with the Stars, Wheel of Fortune, and The Rich List, and also the afternoon show on radio station Classic Hits FM. He hosted "After School" (1989) and co-hosted The Son of a Gunn Show (1992–1995) and Jase television (1992) with his sidekick Thingee, a grey puppet with bulbous eyes.
Christchurch Boys" High School.
He currently co-hosts More FM’s Christchurch Drive show with Lana Searle. Gunn cites many of his presenting skills from being able to pick them up in the first few months at Christchurch from the experienced children"s television crew and presenters around him. Gunn and Thingee also starred in Jase and Thingees Big Adventure, a straight-to-video kids movie based on The Son of a Gunn Show.
Thingee infamously lost an eye during one Son of a Gunn broadcast, though given the show was pre-recorded there is argument that it never appeared on the actual show but only in a blooper reel.
Gunn became the co-host of the Classic Hits FM Breakfast show for Christchurch in 2009. In July 2012, he moved to a nationwide networked show with co-host Dave Fitzgerald.
While other Classic Hits nationwide shows are broadcast from Auckland, the afternoon drive show "Jase and Dave" is broadcast from Christchurch. However, citing family reasons, he resigned from this position at the end of 2013 and broadcast his last show on 20 December 2013.
