Spencer Conlon is a man who keeps to himself in his apartment. To compensate or his isolation, not only does his brother Tom support him, but Spencer has a full security and surveillance system he used to spy on the neighborhood in place of social skills. He has an astoundingly profound memory, especially for faces, which he proves from recalling footage of Detective Benson from weeks before he was visited.
When the detectives were investigating the rape an assault of Rena West, knowing the rapist followed her from the grocery store, Spencer was questioned due to his surveillance footage. He knew precisely the suspect the detectives were looking for, a serial rapist named Mark Foster, spotted on Spencer's camera trying to look like he was reading the paper. This would later prove crucial in Foster's arrest. (SVU: "Unstable")