From Halopedia, the Halo wiki
Senior Engineer Adam Crokett was the naval architect responsible for the refit that the Halcyon-class light cruiser, UNSC Pillar of Autumn, underwent in August of 2552 for Operation: RED FLAG. This refit was carried out at the Inner Colony of Reach just before it fell.
Adam is based off of the Bungie employee of the same name, who modeled the Pillar of Autumn for Halo: Combat Evolved. The character was first mentioned in Halo: Warfleet.