Doc is from the Island of Jamaica, originally, but since he was born to wealthy parents, he was educated the proper way, with years of private school, topped off with Mrs. Abercrombies Charm and Finishing School. He left there to join the Ranger Corps after he signed up with some biochemical corporations to help them produce better computer programs, but found out that his skills were not being challenged.
Doc Hartford, along with the BETA Scientist 'Q-Ball' is responsible for most of the automated systems that the Galaxy Rangers use on a day-to-day basis. His Series V implant allows him direct access to any and all types of computers using animated little '"programs" he created (Tripwire, Firefly, etc.) These programs are actually a form of limited telepathy that can only interface with computers, but enables him almost complete control.