He worked in general practice in Whangarei for 17 years, and was a member of the Northland District Health Board for seven years, before being awarded a Harkness Fellowship to Harvard, in 2007.
He has examined community health issues such as how to improve appointment rates at public hospitals, and once offered to fund a $70,000 survey on fluoride, out of his own pocket.
In 2004 he completed the first comprehensive study of Northland's heath status which revealed a deteriorating state of health, with diabetes a major concern after spending the previous two years pounding the pavements and knocking on doors interviewing almost 300 Northlanders and analysing their information to produce the ground-breaking study.
He returns home every three months or so to treat patients at his Rust Ave practice.
In April this year Dr Reti was called on by the NZ Embassy in Boston to visit the city's hospitals with NZ Honorary Consul Simon Leeming, to see if any of the dead or injured from the Boston Marathon terror blast were New Zealanders or Australians.
"I know Whangarei and Northland as well as anybody and despite being offered a number of incentives to stay (at Harvard) I want to come back and try to make a difference for Whangarei in Parliament," he said.
Dr Reti said he was to the right of centre in his political leanings, believing in strong fiscal responsibility. "But I also believe in a social safety net, so that makes me egalitarian. I also believe in reward for hard work, which makes me centre right," he said.