Fisher was born on the planet Saccharion to a Jewish family. Around 2554, he joined the UNSC Marine Corps. and became an ODST. Fisher fought in the Battle of Earth, and was one of the few surviving ODSTs to be deployed to Installation 00. He left the Installation with other marines, but not after meeting John-117 in person and gaining a dream to become a Spartan.
Fisher was selected in 2554 to participate in SPARTAN-IV augmentations, after which he became the computer specialist in Fireteam Merit. Once with the team, Fisher and the others were assigned to the UNSC Infinity, which traveled to Requiem in 2557. There, he met John-117 for a second time and assisted him during the First Battle of Requiem.
When the Infinity returned the Requiem, Fireteam Merit recieved customized armor configurations and were redeployed to Requiem for a series of special operations. Their current status after Requiem's destruction is unknown.