"I used to work for myself before I went into Parliament; I've gone back working for myself.
Mr Quinn said he was working on a geothermal development in the central North Island but declined to say which one.
He's also working on a forestry project in the same area.
He has relocated to Auckland with his wife and would continue his involvement in the National Party.
Police last year investigated allegations that Mr Quinn was involved in a fracas at a Wellington bank over a parking space.
He initially denied he was involved but later issued a statement confirming he had a part in the "disagreement". No charges were laid.
Prime Minister John Key said today National had not told Mr Quinn they didn't want him back.
"He would have been more than welcome."
Deputy Head of Mission at the New Zealand Embassy in Riyadh Paul Foster-Bell is next on the National list.
Mr Foster-Bell stood in Wellington Central in the last election, losing to Labour deputy leader Grant Robertson.
Mr Key said he would also be more than happy to have Mr Foster-Bell as a National MP.