Machpelah has no one on site but there is an office in Manhattan that handles the business of several orphan cemeteries in the New York area. They have the burial records of Machpelah. Its phone number is 718-366-5959.
This is the cemetery where Houdini and many of his family are buried. It is quite a site to see. The gal in the office was very helpful to me when I spoke to her and asked for information about greatgrandfather and greatgrandmother's burials. The best time to visit is around Memorial Day as they spruce up and mow the cemetery for that Holiday.