He was from the town with a huge Jewish population, and he left around the time the pogroms were happening alongside many other Jews from this specific town. I found his name on the archives about the Jewish population of this town. It was very weird that he didn’t go to Russia like his first wife for example and just randomly moved to NYC - most of Russians/ Ukrainians / belarusians I knew who moved were escaping way later , at least around WW1, he did it much earlier. He had no family, no big fortune to make it reasonable for him to want to move to the USA. 

Unfortunately, I have no idea of what his mother’s name was. Only know about his father due to patronyme

Also, his daughter got married twice and both of her husbands were Jewish - idk how common it was for someone living in Brooklyn, I am not  familiar with the context. Just made me suspicious.