Well, to make a long story short, Jason Alexander is Jewish!
Since Jason Alexander's mother is Jewish, and in Judaism one's religion is based on one's mother's religion, then that makes him also Jewish. His father is Jewish too.
Jason Alexander (who's full birth name is Jay Scott Greenspan) was born on September 23, 1959 in Newark, New Jersey, U.S..
He is best known for his role as George Costanza on Seinfeld, appearing from 1989 to 1998.
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