Marmor was a Human male native of the planet Corellia who served in the Galactic Empire. He eventually defected to the Alliance to Restore the Republic along with the Imperial Army Commander Crix Madine. In 4 ABY, Marmor, by then a corporal, served as a dock mechanic aboard the MC80 Home One type Star Cruiser Home One, managing a staff of seventy-five starfighter and twelve Star Cruiser mechanics in the vessel's rear quadrant.