Jeff is an American man from Riverside, Iowa. He was employed by Emtanon from circa 2019 until August 2023.

Jeff's first job at Emtanon was placing Dead drops. While placing drops intended for WORM agents, he also made the Skagway and Tuktoyaktuk drops for the counter operation.

In May 2023, Jeff was sent to Gough Island to covertly oversee the recently hired interns. During this time, he developed a close relationship with Felicity Love. He warned her about Emtanon's ulterior motives before he disappeared. It was likely Jeff who then arranged Felicity's escape, and sent spooky warnings to the green terminal to leave Felicity alone.

In August 2023, after Jeff was identified as a troublemaker, Desiree tried to kill him by sending him alone on a boat to do a dangerous repair. She made sure his radio's batteries run out shortly after departure, leaving him to die by either starving or falling. Unbeknownst to her, Jeff had a ride arranged to pick him up, which was announced in messages 18282 and 18295 that were unreadable to Emtanon employees.

In September 2023, Jeff upgraded the previously full Felicity's voicemail to unlimited storage, and started using it to send us messages. In October 2023, he made the Riverside drop in his hometown. The same month, he also remotely destroyed Goughcom using electronics he had planted during his stay at Gough; however, the disruption caused was very brief.

In January 2024, Jeff tipped off the FWC about Marine Org's presence in Marathon, Florida, who had been there for a failed operation intended to kidnap Felicity. This led to their vessel WHISPER being confiscated by the US Coast Guard. Afterwards, Jeff reportedly withdrew a large amount of Emtanon money, and fled the United States. (WHISPER would be recovered in May 2024 in Operation Gold Cay, a mission initiated by Maria.)