Hi, Glen - and welcome. Thanks for posting. Of course I'm sorry you have an acoustic neuroma diagnosis but at least you've come to a good place on the internet to seek information, advice and, especially, support from folks who know exactly what you're dealing with right now.
I'm in Connecticut and had an excellent neurosurgeon. Because he wanted to spare my cranial nerves, he de-bulked my large (4.5) AN and I underwent radiation, some 3 months later, according to a detailed plan he had laid out. All went well. My radiation oncologist was excellent. His name is Dr. Johnathan Haas and he now practices in Mineola (Long Island). Should you strike out on finding doctors you can feel confident with in the Manhattan area - which I doubt will happen, as there are quite a few excellent doctors treating ANs in N.Y.C. - I'll give you a link to my doctor's website and that of Dr. Haas.
Meanwhile, I hope you'll make contact with the other New York-area AN patients that frequent and contribute to these forums. I trust you'll be a frequent 'visitor' here and I want to reiterate that we're eager to do what we can to guide and support you through this journey.
Jim