Asif Vali, 56, who denied all the charges, was found guilty by a jury on December 18 of last year following a three-day long trial at Bolton Crown Court.
He was sentenced on Thursday (February 26) at the same court for a string of sex offences he was accused of committing against a woman in Bolton in 2013.
Vali, of Hill Cot Road, Astley Bridge, was found guilty of two counts of exposure, two counts of sexual assault and a single count of assault by penetration.
Huw Edwards, prosecuting, said that Vali’s “sexual interest” in his victim began with texts before he “progressed his sexual behaviour”.
Mr Edwards said that Vali would perform sex acts in her presence and make vulgar suggestions.
He said she “felt afraid of the defendant and also unable to report his behaviour”.
Mr Edwards read a second statement she had written after Vali was found guilty, in which she said: “Asif Vali ruined my life and my potential for a long time.”
She called him a “volatile and unpredictable man”.
The case was heard at Bolton Crown Court (Image: Anthony Moss)
She said that she had felt shame since the incident, and said: “I’ve continued to punish myself for something I know is not my fault.
“I’m slowly beginning to learn that what happened to me was Asif Vali’s behaviour and not mine.
“He can take my self-worth but he will never, never, take away my strength and resilience.”
Tom Worsfold, defending, said that Vali had been on bail for six years until his conviction “without any issues”.
He said that Vali had been previously convicted for unrelated offences when he was much younger, and “he was able to turn his life around following that spate of offending”.
Mr Worsfold said that Vali had been involved with youth work following this, which is when he met Amir Khan before becoming his manager.
He said that Vali’s son had passed away at the age of 15 from cancer in 2015 and “since then he had his own mental health difficulties”.
Mr Worsfold said that following this, Vali had set up a charity to fund children’s funerals.
He called the assault “a significant fall from grace for a man with a strong moral compass and it saddens him to know that work is now tarnished by these offences”.
Judge Clarke addressed Vali and said: “By the time you were 46 years of age you had all the trappings of a successful life.
“You had been involved with Amir Khan in events all around the world and through this you had developed some standing in the local community.”
He said that Vali’s advances were “both unwelcome and offensive to her”.
Judge Clarke said: “This was the most disgusting behaviour – unfortunately she was afraid of you and felt unable to report it.
“She knows what you know – that she offered you no encouragement at all.
“Hopefully these proceedings will bring some closure knowing that she has been listened to, heard and believed.”
Vali was jailed for 11 years, with two-thirds to be served in custody, and was given an indefinite sexual harm prevention order and notification requirements.