I dunno, I grew up in Woodland Hills, Tarzana and Encino Hills. 80% (maybe more) of the girls I dated in High School were Jewish and many of their fathers were associated with the Hollywood good old boy club. Maybe it's different now (my experience was in the mid 70s), but Hollywood at that time was completely run by Jews. You had to be an insider to move up in rank too. I also worked in Hollywood during that time (not in the entertainment businesses directly) and my impression was galvanized by the few years I worked on that side of the hill.