Powell appeared in court last Thursday (credit: Met Police)
William Powell, 66, of East Ham Manor Way, was charged following the allegations of sexual abuse made in May 2018.
The victim was under 13 years old when the offences were carried out between July and November in 2016.
An investigation was launched after the victim disclosed the abuse to a youth practitioner.
Powell was interviewed and then charged on Tuesday, 14 July last year.
The 66-year-old was found guilty at Snaresbrook Crown Court on Thursday, 17 June of two counts of sexual assaulting a girl under 13 by touching.
He has been remanded to appear at Snaresbrook Crown Court on Thursday, 16 September for sentencing.
Detective Sergeant Emma Stockman, the investigating officer, said: “Powell abused the trust placed in him, and his offences are truly shocking. The verdict reflects the seriousness of the actions of a dangerous and predatory offender.
“I thank the victim for having the strength and courage to come forward. Without this, his abuse may well have continued and impacted on further victims.
“The trauma that victims suffer can last a lifetime. I hope that the verdict brings the victim some closure, so that they can begin to rebuild their lives.
“Given the predatory nature of Powell’s offending, there is a possibility that he abused other children.
“We urge any further victims to contact police right away – a specially trained team of detectives are ready to listen and support you.”
If you have been a victim of sexual assault or rape or you have information about an offender, contact police on 101 or 999 in an emergency. There are specially trained officers who will listen and investigate where needed.
Further information, including details of agencies and charities that can offer support, can be found on the Met police website.
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