Whether it is an individual effort or joint effort that Einstein took all the credits fro later, it is still not 100% sure. See the page[1] about Mileva Marić.

It wouldn't be the first time in the history of science that one man was recognized for something just because he was louder in self promotion (see Tesla vs Edison).

I don't claim that Mileva Marić is of Tesla caliber, but treating woman that is as educated as her husband, and who also participated and contributed highly in his early work as a mere home service says a lot about person doing it.

[1] http://en.wikipedia.org/wiki/Mileva_Mari%C4%87#Role_in_physi...