Well, this was fun! I now use Google as my search engine of choice. Their first hit for "Newman Levy" is a list of his papers collected by NYU :The Newman Levy Papers; a search of Bookfinder.com gives a number of Levy titles available from on-line used book dealers:

bookfinder search

"Opera Guyed" had its copyright renewed in Dec 1950, "Gay But Wistful, Verses" in May, 1953

The Web sources I found listed Levy's year of birth as 1888, but none gave a year of death...