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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 lead 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.
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 October 29, 2010.
For three decades Jamie has been the voice and personality of children's character Agro.
Jamie co-starred in the film 'True Love' directed by Robert Braiden for which he won the first Runner up Best Actor Award at the 2012 Picture Start Film Festival' in New York.
Subject of Stalking
For the past 2 years, Jamie has been the subject of an alleged stalker. This stalker, a journalist who he met several times but hardly know, has been sending him threatening e-mails. The woman has since been arrested and will face court in January of 2015 
- "Dunn Leaving Zinc" "The Daily" Accessed 16 October 2008
- "Zinc96 Morning Zoo" Zinc Fm Accessed 23 May 2008
- "Wildlife Warriors" Australia Zoo Accessed 23 May 2008
- "Then and now - Jamie Dunn, B105 entertainer" The Courier Mail
- "Dunn and Dusted" - Jamie Dunn quits 4BC