Career
Before entering Parliament, Hanna practised law. He also served as a Councillor for the City of Marion from 1995 to 1997. He returned to practicing law in 2010 and, in 2014 was elected unopposed as Mayor of the City of Marion.
Hanna is currently on the Board of Victim Support Service, and is Patron of numerous local sporting clubs.
He narrowly lost at the 2010 election despite an improved vote, due to finishing third after all non-major party preferences had been distributed. Hanna sought to have his 2010 election loss overturned by the Supreme Court of South Australia, sitting as the Court of Disputed Returns, saying he fell victim to "misleading and defamatory" leaflets and posters distributed by the Labor Party.
The court ruled the leaflets - labelling Hanna "soft on crime" - were defamatory and not factual, yet there was a right to express such opinions. The court dismissed Hanna"s case.
Hanna unsuccessfully re-contested the seat of Mitchell at the 2014 election.
Some of the local issues Hanna was known to campaign for were: upgrading the Oaklands rail crossing, making Glenthorne a forested recreational park, and turning the old O’Halloran Hill Technical and Further Education site into a high school.