[MaxGabriel]

Actually, that article concludes against equal proportions:

HBR: But gender does play a role?

Malone: It's a preliminary finding--and not a conventional one. The standard argument is that diversity is good and you should have both men and women in a group. But so far, the data show, the more women, the better.

Woolley: We have early evidence that performance may flatten out at the extreme end--that there should be a little gender diversity rather than all women.