the unusual history of the Ashkenazim has subjected them to unique evolutionary pressures that have resulted in this paradoxical state of affairs.
Is the key bit, Ashkenazim Jews throughout history have remained pretty much an isolated genetic group where as Europeans and East Asians didn't tend to breed in the same way. Although it is true that Ashkenazim Jews tend to have disproportionately high intelligence from both an IQ and success stand point no one can currently say for sure if it is genetic, social, environmental or a combination of all three. Present day knowledge of genetics hasn't progressed to the point where we can say for sure but this paper is only really relevant to Ashkenazim Jews and is not intended to provide insight into other ethnic groups (especially ones so broad as white Europeans or east Asians) as the development and history of most is completely different