Well, to make a long story short, Judd Apatow is Jewish!
Since Judd Apatow'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.
Judd Apatow was born on December 6, 1967 in New York City, New York, US.
He is an Emmy-winning screenwriter, producer and director known for films like The 40-Year-Old Virgin, Knocked Up and This Is 40. He is also an executive producer for the HBO series Girls.
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