Well, to make a long story short, Jeremy Piven is Jewish!
Since Jeremy Piven's mother is Jewish, and in Orthodox Judaism and Conservative Judaism, those with a Jewish mother (or those who underwent a halakhic conversion) are considered Jewish, then that makes him Jewish. His father is Jewish too.
Jeremy Piven (whose full birth name is Jeremy Piven) was born on July 26, 1965 in Manhattan, New York City.
He is best known for his role as Ari Gold in the television series Entourage for which he has won one Golden Globe Award and three consecutive Emmy Awards as well as several other nominations for Best Supporting Actor.
If you see any details that require update, please Let us know!