Frank Russell Walmsley (57) was found guilty of the charges, including 13 of rape, in the High Court at Timaru on April 26.
He learned his sentence today, after a series of harrowing victim impact statements were read by victims, police officers and Justice David Gendall.
Following a 13 day trial and 16 hours of jury deliberations, Walmsley was found guilty on 23 charges involving four victims during his time at the Oamaru Child, Youth and Family home from 1995 to 2000.
Walmsley raped two teenage girls and attempted to rape another while at the home, which he ran with his wife.
He was also found guilty of 29 charges against four additional victims when he practised alternative medicine as a life coach from 2005 to 2012.
While acting as a life coach, Walmsley repeatedly attacked one victim for several years, starting from when she was aged under 12. The 13 offences he committed against the girl included representative rape charges from 2005 to 2011.
Only three of the 52 offences were not sexual in nature: Walmsley was found guilty of assault with a weapon, a dog lead, and two charges of assault.
Aside from the 13 rape charges, Walmsley was convicted of 37 additional sexual offences. They included nine charges of sexual conduct with minors, 13 charges of unlawful sexual connection, and 11 charges of indecency.
He was first investigated in 2000, but escaped charges.
After a victim came forward while he was acting as a life coach, police renewed their investigation into his time as a caregiver. The original complaints were reinvestigated and three more victims came forward.
Walmsley denied all the charges against him. He did not give evidence at trial.
