I don't have the time or inclination to do this work, but just did a quick lookup. His mother was born in NY. Her father came from Russia in 1890 or 1891 and her mother came from France or Germany. Family Search has loads of birth, marriage, and census records for all the family members. It shouldn't be too difficult to find immigration records using the info already available. Try jewishgen.org, where you have to be a member to use the databases, but membership is free (except that they'll send you a lot of spam begging for donations).
I have managed to get the 1 step farther back to work on profiles of the immigrants, but have not yet managed to get anywhere with people behind them who were born and died in the other country.
(edited) Warning - when someone is listed as having been born in Russia in the 1800's or early 1900's, that does NOT mean Russia - it only means the Russian Empire and the person could have been born in Lithuania, Ukraine, Poland, Czechoslavakia, Yugoslavia, or a whole bunch of other countries!!!