Trevor Bolton was jailed after a two-week trial in which a jury found him guilty of abusing eight boys aged 11 to 15 at the now-closed Carmel College.
Bolton was convicted of 25 counts and jailed for 10 years for serious sexual offences, six years for 16 counts of indecent assault on a boy under 16, and a further three years for six counts of indecency with a child.The sentences will run consecutively, giving a maximum of 19 years.
The length of the jail term "reflects the severity of Bolton's crimes", said Detective Constable Trish Coyne of Oxfordshire Police.
"While the offences took place some time ago, and despite the fact Bolton's eight victims are successful individuals, every one of them has admitted the offences had an impact on them well into their adult lives. They have waited a long time to see justice be done."
Adrian Foster, the area's Chief Crown Prosecutor, said: "He abused his position of trust and took advantage of his status. It is only due to the great courage of the victims that the despicable behaviour of this man has been exposed."
