The doctor said he chose his career path to help people who did not have the necessary medical assistance.
"When I was young I wanted to work for poor people, particularly in poor countries.
"It's very rewarding."
He returns to New Zealand regularly to work as a doctor to fund his travels and to recruit volunteers.
"We are a very lucky country, everything is available to us."
The doctors shows no sign of slowing down.
"As long as I'm healthy I'm going to continue."
At a medical tribunal this week, the doctor admitted treating patients in New Zealand without a current practising certificate. He was ordered to pay a share of costs.
He said he was unaware his application for a two-week practising certificate was still being processed when he begun practising at a North Island medical centre. He said he stopped working at the practice when he was told of this.
A second charge of ordering unusually large quantities of medical supplies was dismissed.
"I was disappointed with the costs [ruling] as I don't know how I'm going to pay it but I'm working on a plan," he said.
It was likely he would extend his stay in New Zealand and work as a doctor, to pay off the costs.