Phil used to be a railway worker until the NCR shut down the line he had been working on. He never spent time in a powder gang, but he spent plenty of time as a bounty hunter tracking down his old comrades (a not-too-endearing aspect of his history). Sparky, his companion, was one of those he tracked down. Sparky was one of the few survivors of the explosions in the Burham Springs mine, and a former railway worker with Phil.
Phil has not appeared nor is he mentioned in any published game. He was to appear only in Van Buren, the canceled Fallout 3 by Black Isle Studios. It is not certain if he will appear in any future Fallout game.