I found an address for John Corthellos in an old (50s/60s) address book that belonged to my relative. It has his address as Greenlawn Cuba Hill Road, RFD5 Huntington, Long Island, NY. I am not a relative and have no other info at this time.
Also found some photos of my aunt, Mary Bensh, and her friend, Barbara Wasil, taken at his home. John is in photo with the cats crawling on Barbara Wasil. No reference to people in group photo (Barbara and Mary are in middle). There is a note on the back of the boat photo that it is the Cabin Cruiser at John Corthellos place.