I can't figure out what's going on with the gender thing, actually. Minamoto Hisanari seems to consistently list themselves as female on all their online profiles (their Pixiv profile also says female) but yeah, they refer to themselves as a man in Wife and Wife, there's what Erica Friedman said, and the portrayal of "yuri marriage" in The World is Full of Yuri was done in a way that was... not something I can easily imagine a woman who was attracted to women writing.
Whatever the case, definitely one of my favorite yuri mangaka. That small criticism of The World is Full of Yuri aside, their manga is so sweet and good-natured it's outright poignant, and I can't think of anyone who does that type of yuri better than them.