The former Pamapuria School deputy principal is to be sentenced in the High Court at Whangarei this morning after admitting 74 sex charges relating to sleepovers with boys at his Awanui farm.
Parker, 38, had formerly been held in high regard in the small community of Pamapuria, near Kaitaia, which has been badly shaken by the case.
An independent report ordered by the commissioner now running the primary school found Parker used his charm and influence as deputy principal and kapa haka tutor to befriend families and host boys at his farm.
The abuse occurred when Parker and the boys would sleep "marae-style" on mattresses in the lounge, the report said.
Police first investigated Parker after receiving a complaint of indecent assault March 2009. He was placed on leave while an investigation took place but the next month the allegation was retracted and he returned to teaching.
Nonetheless, police sent former principal Stephen Hovell a letter saying the sleepovers were inappropriate and had to stop.
"In my view it is clearly inappropriate for a school teacher to invite young children to their residence, outside of school hours, and have them sleeping over," Detective Dean Gorrie said in the letter.
"I would suggest that this practice must stop immediately, and protocols be initiated to discourage them from occurring in the future."
Mr Hovell was sacked in February this year after an investigation found he had not heeded this advice, and had opted to protect his deputy instead of his students.
The investigation found Mr Hovell did nothing to manage the return to school of students who had complained about Parker, nor did he monitor Parker's activity after he began teaching again.
In August last year Parker pleaded guilty to 49 sexual abuse charges, which prompted more complainants to come forwards.
In April this year he admitted a further 25 charges, including five allegations of sexual violation involving two boys, the most serious charges he has faced.
In all, the allegations involve 20 victims, aged 9 to 16 at the time, and date from 1999 to 2012.
At a previous hearing in Kaitaia District Court, Judge Greg Davis said the sentencing was complex because: "I have not been able to find similar offending or a similar extent of offending."
