A prison psychologist who fell for her child rapist client, a member of the notorious Skaf gang, has been disqualified from practising.

Joanne Senior, 33, was working at Parklea Correctional Centre in 2011 when she began counselling the man, known for legal reasons as Client A.

Client A took part in the rape of three teenage girls by Bilal Skaf's gang.

Client A took part in the rape of three teenage girls by Bilal Skaf's gang, which terrorised Sydney in the lead-up to the 2000 Olympic Games. The sentencing judge called the crimes "callous, violent, sordid and degrading".

Client A's IQ score placed him in the bottom 1 per cent of the population; in jail he was diagnosed with an antisocial personality disorder and sexual perversion.