wikipedia has long been, like more of the internet, a male domain.
That is why on occassions there are days dedicated to women trying to correct blatant falsehoods, usually about feminism, and distortions. And indeed try and match the number of entries about men, with entries about women.
However it is a bit of a free for all, where the dominant group (men) are able to quickly reverse any attempt made to create a more balanced entry. And being completely satisfied that if they dont know about something they will delete, or get deleted, more pro woman entries.
As far as I know anyone can sign up to make entries additions to wikipedia, but be prepared to have to be endlessly vigilent and face a very topsy turvy view of when something is valid.
In fact there are regular "editathon" held by women in various professions, historians, etc., to try and redress the balance.