Who is the lead UI designer in Microsoft?

The fact that I don't know, and spend too much time reading tech blogs, and yet I know about people like Duarte and Ive, makes me wonder how much of a say do designers have in MS.

It seems to me, as a long time WP user, that designers had more of a say earlier (negative space on the homscreen, hubs..) but nowadays corners are being cut and it is engineers and marketing managers who always have the last word (xbox music, getting rid of the hubs..).

I know a lot of changes are for the better, but after checking out the new google design language, I'm thinking maybe designers should have a bigger say, if that's what's going on.

Any thoughts? Of mark?