7
/10
John Greer is a fictional character portrayed by John Nolan in the TV series Person of Interest.
In the first episode they appeared in, titled Dead Reckoning (season 2), they were 74 years old.
They appear in 29 episodes out of a total of 103 aired

John Greer

by John Nolan

character

Episodes29

  • 9.2
    /10

    Dead Reckoning
    episode S2.E13 january 2013
    Reese finds out that being saved from prosecution by Stanton means having a bomb strapped to his chest while he and Snow do her biding.
  • 8.6
    /10

    Trojan Horse
    episode S2.E19 april 2013
    Finch goes undercover at a tech company to watch a rising VP. The company appears to be riddled with agents who are a front for something more sinister. Shaw reappears and takes an interest in Root. HR decides to rub out an informant.
  • 9.4
    /10

    Zero Day
    episode S2.E21 may 2013
    They wait ten days for a new number due to a system virus, suspecting Root is the problem. It's for Ernest Thornhill, who isn't who, or what, he is supposed to be. At stake is The Machine - will it remain with Finch or end up with Decima?
  • 9.1
    /10

    Aletheia
    episode S3.E12 january 2014
    Sameen, Harold, and Arthur make their escape. Root is captured and tortured. The others go to recover Arthur's back up hard drives but are caught in the crossfire when Vigilance arrives to claim them for themselves to expose Samaritan.
  • 9.3
    /10

    RAM
    episode S3.E16 march 2014
    A flashback to the early days of Finch's operations reveals secrets and connections with far-reaching implications.
  • 9.1
    /10

    Root Path
    episode S3.E17 march 2014
    The Machine tasks Root to find a janitor who has a mysterious past. However, when her presence endangers him, the Machine sends his number to Finch as well.
  • 8.2
    /10

    Allegiance
    episode S3.E18 march 2014
    The team gets involved in a case of international politics when a former government contractor stalks a U.N. diplomat. Meanwhile, an adversary tries to take advantage of Root.
  • 9.1
    /10

    Death Benefit
    episode S3.E20 april 2014
    Reese poses as a Secret Service agent to get close to the latest POI, a U.S. Congressman who may hold the key to derailing Decima's plans to bring a second Machine online.
  • 9.2
    /10

    Beta
    episode S3.E21 april 2014
    Decima hunts down Reese and Shaw using Samaritan's feeds. Meanwhile, Greer sets a trap for Finch by targeting his former fiancée, Grace.
  • 9.1
    /10

    A House Divided
    episode S3.E22 may 2014
    While Reese and Shaw search for Finch and a way to stop Decima, The Machine gives them 5 new numbers.
  • 9.7
    /10

    Deus Ex Machina
    episode S3.E23 may 2014
    The team takes desperate action in its race to prevent Samaritan from coming online and making them its first targets. Meanwhile, the months-long battle with the anti-surveillance terrorist group Vigilance comes to a shocking conclusion.
  • 8.9
    /10

    Panopticon
    episode S4.E1 september 2014
    Required to assume new identities created by Root, the team tries to adapt to their new lives, but a new number complicates things.
  • 9
    /10

    Prophets
    episode S4.E5 october 2014
    On Election Day Reese shoots a potential jumper and is forced to go into counseling. The new number is for a pollster who suspects the election for Governor of New York was rigged. It was - by Samaritan, and his life is now in danger.
  • 8.7
    /10

    Pretenders
    episode S4.E6 october 2014
    John and others try to prevent a fake detective from getting himself killed, while Harold attends a conference in Hong Kong.
  • 8.7
    /10

    Point of Origin
    episode S4.E8 november 2014
    Reese volunteers as an NYPD police academy instructor in order to keep an eye on a talented young officer whose suspicious actions make him question her motives. Meanwhile, Martine, armed with information from Samaritan, hunts a member of the team.
  • 9.4
    /10

    The Devil You Know
    episode S4.E9 november 2014
    Reese must save Elias from the Brotherhood. He can't get any help from Root or Shaw since Shaw's cover is blown and Root is escorting her to underground.
  • 9.1
    /10

    The Cold War
    episode S4.E10 december 2014
    Samaritan demonstrates its true power by taking control of New York for 48 hours and erasing crime from the city in an attempt to lure The Machine out of hiding.
  • 9.8
    /10

    If-Then-Else
    episode S4.E11 january 2015
    Samaritan launches a cyber-attack on the stock exchange, leaving the team with no choice but to embark on a possible suicide mission in a desperate attempt to stop a global economic catastrophe.
  • 9.2
    /10

    Control-Alt-Delete
    episode S4.E12 january 2015
    Control is back and begins to question the methods and intentions of Samaritan. Also, alarming news reports of a pair of vigilantes rampaging through the Northeast begin to surface.
  • 8.8
    /10

    M.I.A.
    episode S4.E13 february 2015
    The hunt for Shaw takes Root and Reese to a small town in upstate New York where not everything is as idyllic as it seems; Fusco and a former person of interest team up.
  • 8.7
    /10

    Q & A
    episode S4.E15 february 2015
    Reese tries to protect a software programmer with mysteries in her personal life. Meanwhile Finch reconnects with Claire, the young woman he met while she was playing Samaritan's Nautilus game.
  • 8.8
    /10

    Search and Destroy
    episode S4.E19 april 2015
    Reese and Finch scramble to protect a software CEO when his behavior becomes erratic following a hacker attack that reveals all his secrets and unravels his life.
  • 9.5
    /10

    Asylum
    episode S4.E21 april 2015
    Reese and Fusco get caught in the war between Elias and Dominic while Finch and Root follow a clue to Shaw's whereabouts.
  • 9.7
    /10

    YHWH
    episode S4.E22 may 2015
    Finch and Root race to save The Machine, which has been located by the rival AI, Samaritan.
  • 9.1
    /10

    SNAFU
    episode S5.E2 may 2016
    Root and Finch work on bringing Northern Lights back online. They are successful and thus they start receiving numbers from the irrelevant list. However, the Machine is not as productive as before.
  • 9.3
    /10

    6,741
    episode S5.E4 may 2016
    Shaw escapes her captors, but the team is unsure of her mental state when she begins to act paranoid and reckless.
  • 8.3
    /10

    A More Perfect Union
    episode S5.E6 may 2016
    The Machine sends Reese and Finch to a wedding to protect a pair of POIs before their nuptials. Also, Fusco becomes angry at being kept in the dark by the team and takes it upon himself to investigate a string of missing person reports.
  • 9.7
    /10

    The Day the World Went Away
    episode S5.E10 may 2016
    Finch's number comes up when his cover identity is blown and sets off a deadly series of encounters with Samaritan's operatives.
  • 9.5
    /10

    .exe
    episode S5.E12 june 2016
    As Reese and Shaw race to catch up with Finch, he infiltrates a maximum-security government facility in a desperate mission which could mean the end of the war with Samaritan.