Top notch doctors I have heard of in the New York area include Dr. Bernstein, Dr. True and Dr. Dorin, Dr. Epstein and Dr. Feller.
If you search for any of those names online, you are sure to find all kinds of patient experiences and reviews that have been positive.
While I don't have personal experience with any of those particular doctors, as I chose Dr. Rahal in Ottawa (Canada), their names come up quite a lot in online discussions from patients, and potential patients about their refined skills in hair transplantation.