CTV News has spoken with a current patient of a Calgary psychiatrist charged with sexual assault.

The man says he was shocked to hear about the charges against Dr. Aubrey Levin.

"I'm glad someone was brave enough to step forward," says the patient who was under court order to be assessed by Dr. Levin.

The patient CTV spoke too was dealing with a gambling addiction and felt something wasn't right when Dr. Levin asked him , what he felt were, inappropriate questions about his sexuality.

"I didn't want him to write anything negative about me. So I pretty much kept quiet through the whole ordeal and the next time I came forward I was going to bring a tape recorder and record everything he was going to say, just to protect myself,' says the patient.

Levin is charged with sexually assaulting a 36-year-old male patient of his. It's alleged the sexual assault happened repeatedly.

The alleged victim had asked for help but when nobody believed him he took a hidden camera tape to a therapy session.

CTV News has learned it was that video tape recording the led to Levin's arrest

Levin is a psychiatrist who often conducted psychiatric assessments on people facing criminal charges.

He has been stripped of his credentials pending an investigation by the College of Physicians and Surgeons.

Alberta Justice says it will review all cases in which Levin was an expert witness to figure out if any testimony has been tainted.

"We'll be looking over every single file this doctor had any conduct with and, unfortunately, when something like this happens everyone looks back over the last 20 years with clients to see how bad it was," says Adriano Iovenilli, a defence lawyer.

The College of Physicians and Surgeons says Dr. Levin had a clean record since arriving, several years ago, in Canada from South Africa.