Who maintains your user security?

I hope this isn't an inappropriate question for this community: I'd like to know who in your organization handles your PeopleSoft user security. What department and title, and is it done in one area or do different departments handle it, etc? Anything you can share is appreciated.

(We are on HCM 9.2, using Human Resources, Benefits, Training, Absence Management, Time & Labor, Payroll For North America.)

Thanks,

Leslie