Marcus Marcussen, 91, arrives at Birmingham Crown Court.
A 91-year-old former Birmingham PE teacher has been convicted of sexually abusing 13 boys over three decades.
A jury at the city's crown court found Marcus Marcussen guilty of 23 charges of indecent assault after deliberating for almost 12 hours.
Marcussen was found not guilty of five charges of indecent assault and three of indecency with a child.
The findings of guilt relate to 13 victims.
The jury failed to reach verdicts on two other indecent assault charges and have been given a majority direction by Judge Nicholas Webb in relation to those counts. He said he would accept a verdict from 10 of the jurors.
Birmingham Crown Court had previously heard that Marcussen, of Rochford, near Tenbury Wells, taught at Ilmington Road Comprehensive School in Weoley Castle between 1945 and 1983 before retiring.
Sarah Buckingham, prosecuting, said he "hid behind a veneer of respectability" and that the abuse happened during PE lessons at the school and at a swimming club called the Square Club in Weoley Castle.
Pupils were made to strand on chairs, while the teacher abused them and were also made to swim naked.
They were also made to take part in naked during scuba diving lessons, when the defendant would watch them underwater through a diving mask.