A shrunken old man in a white robe. This is Dr. Fung. He has 130 hps.
Dr. Fung is in San Francisco, in one of the first buildings on the east of the town's entrance. Starting from the communism's statue, it's the building in the bottom-right corner. He can teach you everything that wannabe Doctor needs to know if you got spare caps. He also sells medical supplies, Bio Med Gel, Doctor's Bags and Paramedics Bags.
Note: You need at least 3 in Charisma to be able to talk to him.