I assume you're referring to Dr. Chillingworth (Dr. Prynne). He's Hester's husband who was to join her after taking care of some business. We must assume he was educated in Europe since that is where they came from. I'm curious as to why you put the word "doctor" in quotation marks, however. Is there a question here that I'm missing? Please let me know if I haven't answered your question, and I'll try to help you.
she or he put "doctor" because he studied alchemy