Dilworth’s former assistant principal sexually abused boys on scouting trips, school camps and in the school’s sick bay.
Ian Robert Wilson appeared by audio-visual link from Waikeria Prison at the Auckland District Court on Thursday where he admitted sexually abusing a further five boys in his care.
It is the third time the 71 year-old has been convicted for sexual abuse at Dilworth between the 1970s and 1990s.
He pleaded guilty to 19 charges, including 11 of indecency on boys, two of indecently assaulting a boy and six charges of doing an indecent act on a boy.
Wilson, who had a plaster on his left cheek and another on his right temple on Thursday, answered guilty to each charge in a thin voice.
Wilson was a history teacher and is fluent in te reo Māori. He was also a housemaster and a scout leader and would regularly take boys away on scouting trips.