Holocaust Mystery from Miedzyrzec Podlaski

Samson Zelig Rubinstein ... One could learn about existence of this person from Wikipedia on Międzyrzec Podlaski. He is listed here as one of the notable people of this town - no one probably can know from this site what is his contribution to the town.

So finally there is some info about him - he is a Holocaust Survivor. A mysterious Holocaust Survivor from Miedzyrzec Podlaski.  So here is the issue ... how to find out information on a holocaust survivor name Samson Zelig Rubinstein?

Very little information was so far revealed. His grave marker, in Oakdale Cemetery, Wilmington, NC, says that he was born in Miedzyrzec Podlaski, Poland on July 21, 1934 also he is a veteran of the Army.  A small obituary note was in the Wilmington Star News when he passed away.

It is so odd that there is no more info about him. How can such a important part of his history be address in so few words in a place where he lived with the family?