Yoh Yoshinari, of Gainax, then Trigger, has been a mecha designer/animator for Gurren Lagann, Gunbuster 2, Evangelion, and Panty & Stocking with Garterbelt, the mastermind of Little Witch Academia, and opening animator and set designer on Kill La Kill, and, he's also apparently a Bronie. In fact, he has a semi-stealth account on Japanese art portal Pixiv dedicated to My Little Pony work.
Pictures were mostly posted a year before My Little Pony: Friendship is Magic's April 2013 Japanese release.
If you're not sure what Yoh Yoshinari animated...
And a few of his tribute illustrations from Gainax's site