Annie Parisse is better known to Person of Interest fans as John Reese’s CIA training partner, Kara Stanton.
Snow is on a constant hunt for Reese during most of his time on Person of Interest.
Snow wouldn’t be the easiest of handlers, either; he set up Stanton and Reese to be killed twice, just in one mission.
So, it looks like even though both Mark Snow and Kara Stanton appeared to be super dead by the finale of Person of Interest, the showrunners enjoyed working with the actors and writing their espionage-heavy storylines.