A former boarding school head from Staffordshire faces a lengthy jail term after being convicted of abusing boys during the 1970s and 1980s.
Derek Slade, 61, of Burton-on-Trent, was convicted of more than 50 offences and will be sentenced on Monday.
A jury at Ipswich Crown Court found him guilty of sexually assaulting and beating boys between 1978 and 1983 at private schools in Wicklewood, Norfolk, and Great Finborough, Suffolk.
Slade admitted during the month-long trial to being a paedophile, saying there was a sexual motive behind the corporal punishment he would inflict at the boys' boarding school.
He told Ipswich Crown Court he went too far in the beatings at St George's School in Wicklewood, Norfolk, which later moved to Great Finborough, Suffolk, after which he would rub the boys' bare buttocks.
He denied allegations of more serious sexual assaults, including hosting so-called "midnight feasts" at his home in the school grounds at which schoolboys would allegedly be subjected to sexual attacks.
Oxford-educated Slade, who has no teaching qualifications, set up the school with colleagues and is alleged to have carried out the attacks from 1978 to 1983, giving the boys sweets or toys afterwards.
When police searched Slade's home in Burton-on-Trent, after his arrest in February, they found dozens of the essays Slade had kept in files along with photographs of boys he had taught, the jury was told.
Slade admitted to the court there was a sexual motive behind keeping the essays, saying he now accepts he was a paedophile and had behaved in a "grossly improper" way. He added: "I was in denial."
But he denied six counts of assault occasioning actual bodily harm, five counts of indecent assault on a male person and four counts of a serious sexual offence.
He admitted 15 counts of indecent assault on a male person and five counts of assault occasioning actual bodily harm.