Dr. Trintignant was a surgeon who operated on Yellowstone in the period preceding the Melding Plague. He specialized in extreme cybernetic alterations to the human body, and was himself heavily transformed. He filled a niche in the decadent Chasm City society, where body modifications was common among the upper classes, although he went further than most. Operating in a gray market, tolerated by society but thought of as perverse, he was able to find enough willing subjects to gain considerable knowledge in turning humans into improved cyborgs.