In this essay, I use the Lawrence Summers controversy as a jumping-off point for some idle speculation about gender differences in the world of academics and business.
My experience is that in male-dominated organizational groups...Guys tend to flatter the boss in the belief that this will help them build a useful relationship. They try to make their rivals look bad and try to make themselves look good. They disregard people who they think are not in a position to promote them or to compete with them.
...So to Lawrence Summers' list of possible reasons that women are under-represented in some fields, let me add annoying male-dominance behavior. To the extent that one must put up with or join in such behavior to succeed in largely-male fields, I could see where otherwise qualified women might not have the taste for it.