Up until 2005, Dunn was a member of a radio breakfast show in Brisbane. Dunn was an original member of the B105 Morning Crew, along with Donna Lynch and Ian Skippen when the station was first launched on the FM band in 1990. Whereas originally Dunn performed on B105 as Agro, over time he came to be credited as himself. The B105 Morning Crew led the breakfast time slot ratings until the end of 2004 (for about 115 consecutive radio surveys).
Dunn performed stunts such as dressing in a gold string bikini as a meter-maid for a stroll around town, dressing as a bride for the "Bridezilla" competition, performing a cheerleader routine during the halftime break at a Broncos game, being scrubbed head to toe in a portable dog wash, and a nude dash across a stage.
Dunn raised money through the station for the Royal Children's Hospital. The appeal aimed to raise money for vital equipment for the hospital based solely on donations from businesses and people in Brisbane. Dunn promoted the annual Christmas Appeal, including taking part in the 'K's for Kids' walk that stretched across Brisbane. Dunn has been an active ambassador for the conservationist organisation, Wildlife Warriors.
On 21 September 2005, Dunn announced he was leaving B105 and in 2006, he and Agro began to present on the "Zinc Morning Zoo" with Ian Calder and Courtney Burns on Sunshine Coast FM radio station "Zinc 96." He left Zinc96 on 17 October 2008.
In 2009 Dunn began broadcasting a talk-back show on 1116 4BC, departing on 29 October 2010.
For three decades Dunn has been the voice and personality of children's character Agro.
Subject of stalking
Between 2012 and September 2014, Dunn was the subject of a stalker responsible for online harassment and threats of violence. This stalker, a journalist whom he met several times but hardly knew, was sending up to 50 emails a day. She pleaded guilty to stalking in Caboolture Magistrates Court in December 2014, and was fined $1000 and put on a two-year good behaviour bond, with no conviction recorded.
- "Jamie's B105 farewell". radioinfo.com.au. 3 December 2015. Retrieved 17 July 2015.
- "Wildlife Warriors" (PDF). awrc.org.au. Retrieved 17 July 2015.
- "Dunn leaving Zinc". Sunshine Coast Daily. 16 October 2008. Retrieved 17 July 2015.
- Calligeros, Marissa (29 October 2010). "Dunn and dusted: radio host quits 4BC". Brisbane Times. Retrieved 17 July 2015.
- Ogilvie, Joseph (20 September 2015). "Life changes from high-end bake to boss of snakes". Brisbane Times. Retrieved 2 December 2015.
- "Jamie Dunn". Platinum Speakers. Retrieved 17 July 2015.
- Lergessner, James (2013). Cloudland: Queen of the Dance Halls. Brisbane, Australia: Boolarong Press. p. 211. ISBN 1922109770.
- "The 16th NYC PictureStart Film Festival, 2012". picturestartfilmfestival.com. Retrieved 17 July 2015.
- "Jamie Dunn tells of stalker horror and the real aggro". Retrieved 16 January 2015.
- "Insult to Agro Vation for top jock as stalker wins inspiration award". Retrieved 16 January 2015.