Harold Greer

A calculating leader of Decima Technologies who orchestrates the capture of Cyrus Wells to obtain the chip that could activate Samaritan.

Harold Greer is a character in the American television drama series Person of Interest. He is portrayed by John Nolan. In the episode 'The Devil's Share' (Season 3, Episode 18), Greer is identified as a leader of Decima Technologies. He monitors from a command center as his men locate Cyrus Wells and Root in a park, where they interfere with signals to cut Root off from the Machine. His men then capture Cyrus, though Reese unsuccessfully tries to stop them. Greer later orders his men to take Cyrus to Maxwell Limited, a private defense contractor that holds the chip for the NSA, where they use Cyrus's retinal scan to gain access. After gaining entry, Greer orders his men to kill Cyrus, but Reese and Fusco arrive to save him. The supercomputing chip that could activate Samaritan is recovered by Decima Technologies off-screen, as revealed in later episodes.

Quick Facts

Affiliation: Decima Technologies
First appears: Season 3, Episode 18

Reader's Guide

Harold Greer appears in the episode "/" as the leader of Decima Technologies. He personally tracks down Cyrus Wells, the janitor who is the team's number, and Root in a park. Using signal interference, he cuts Root off from the Machine, allowing his men to capture Cyrus. Greer then orders Cyrus taken to Maxwell Limited, an NSA-controlled company housing an advanced supercomputing chip needed to activate Samaritan. After Cyrus's retinal scan grants access, Greer orders his execution, but Reese and Fusco arrive to save Cyrus. Decima Technologies escapes with the chip, advancing the development of Samaritan. Greer's role in this episode is central to the plot, as his actions directly threaten the Machine and its team.