REGULATING PSYCHOLOGISTS IN NOVA SCOTIA SINCE 1980
Category: Registrant

As per PHIA legislation, the operator of the organization / organization is considered the custodian:(i) a regulated health professional or a person who operates a group practice of regulated health professionals….

Consequently in a group practice, where psychologists are employees, not an owner or operator of the practice, the organization would generally be seen as the custodian to handle matters that arise with access to files once the employee departs.

While you could reach out to the psychologist (or former registrant) as a courtesy to let them know there has been a request, they would not be in any role to approve any aspect of work done / engagement with the file since they are no longer an employee and the organization is the custodian and owns the files.

Reference: 
Custodian of client files when employee leaves practice