What is behind the phenomenon described by J. J. Goldberg and Alan Dershowitz? Is it simply hard work and talent?

J. J. Goldberg, editorial director of the newspaper The Forward, in 1997 published a study of this myth regarding the United States,[39] concluding that, although Jews do hold many prominent positions in the U.S. media industry, they "do not make a high priority of Jewish concerns" and that Jewish Americans generally perceive the media as anti-Israel.[40] 

https://en.wikipedia.org/wiki/Antisemitic_canard#C... .

Scholar Alan Dershowitz said of the subject: So let's stop all this nonsense about Jewish control over the media and praise those individual Jews who, by dint of hard work and talent, have earned their place, as individuals, in so many areas of American life. I always thought that was the American dream.[50] .

https://en.wikipedia.org/wiki/Antisemitic_canard#C... .

J. J Goldberg whom is himself Jewish admits that Jews do hold many prominent positions in the U.S. media.

Scholar Alan Dershowitz whom is also Jewish says that it is simply because those Jews are hard working and full of talent that have earned their place as individuals.

Now let us not lie to ourselves. Judaism is a minority religion unlike Christianity and Islam and a disproportionate amount of Judaists find themselves in high society. I am not saying this is because of any nefarious conspiracy. Is there something about Judaism or Jewishness that makes Jews more hard working and talented than Christians, Muslims and Atheists?