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Specializing in espionage and the Sangheili, Spenser was stationed on the former colony-world Reynes for two years, which was subjected to glassing during the Human-Covenant war. His age is unknown, but he is in his fifties by 2553. He conducted his spying from a station located in the planet's mining facilities. He was alone as far as humans were concerned, however several Kig-Yar would often come to scavenge and to trade information with him. According to Spenser, an Unggoy would also come once a week to clean.
A few years later, he would become the primary liaison between Pax Institute and the ONI Research Facility Trevelyan. He would be a part of the battle at the Repository against the creature known as the Rafakrit.
- Halo: Glasslands (First appearance)
- Halo: The Thursday War
- Halo: Mortal Dictata
- Halo: Legacy of Onyx