Virgil is a former employee of the CIA who went freelance.
Carrie hires Virgil to put "eyes and ears" into every room in Nick Brody's house and to observe the audio/video feeds for her while she's at work. Because Carrie is paying only $1000 a day, Virgil performs a bare bones job with his younger brother Max instead of with his normal team (Nick and Eddie). Virgil, Carrie, and Max eavesdrop on what they thought was a suspiciously clandestine meeting for Nick, but actually turned out to be a private discussion with Thomas Walker's widow, Helen. Virgil confronts Carrie about the anti-psychotic medication Max found in her bathroom.
Personal life and relationships
Virgil trusts Carrie and says he loves her, despite whatever issues she might be going through. Max is his younger brother. When he's hired at his normal rates for surveillance, he works with two guys named Nick and Eddie.
Background information and notes
Virgil performs his services under the guise of a business named "Ballard Home Communications".
Since he is the brother of Max, we learn in Season 6 that his last name is Piotrowski.