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I have two corrections to the above reply.
The abbreviation that was read as "May G-d avenge his soul" (which would be a three-letter abbreviation), is actually the two-letter abbreviation for "G-d fearing". (G-d's name can be abbreviated as a Daled in addition to as a Hay).
His father's name was Aryeh. It appears to read Ari, but a closer examination reveals an abbreviation mark, indicating that the last letter of the name was not engraved. This is sometimes the custom, when spelling out a person's name in full would also be spelling out G-d's name at the end.
Brooklyn, New York, USA