Raised in a Greek family in Astoria, Queens, Callas made a name for herself in Internal Affairs before elevating to Major Case Squad. It might have something to do with her flawless efficiency, cool handling of investigations and ability to appease both her higher-ups and subordinates.
Her pragmatic style and political savvy is what makes her a standout as captain and respected by her detectives. She'll be the first to point out your faults, but also the last to withhold deserved praise.
As the new captain in the MCS squad room, Callas has filled big shoes with a sensible command and sharp intellect.