Simon Ball has been convicted of nine charges relating to his time at two schools
A jury has been dismissed after failing to reach a verdict on five counts of sex offences allegedly committed by a former boarding school teacher.
Simon Ball, 42, of Combe Avenue, Greenwich, London, was found guilty of four counts of engaging in sexual activity while in a position of trust at Giggleswick School, North Yorkshire.
He had already admitted five counts of the same charge relating to his time at Kimbolton School, Cambridgeshire.
He will be sentenced on 29 November.
The jury could not reach a verdict on four counts of indecent assault and a further count of engaging in sexual activity while in a position of trust between 2001 and 2004, all relating to Giggleswick School.
Cambridgeshire Police said Ball's actions were "predatory offences committed against vulnerable, young people by a person in a position of trust".
During his trial at Peterborough Crown Court, the jury heard Ball had escaped prosecution at the school near Settle before offending again at Kimbolton School near Huntingdon.
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