it is the person who won the minecon 2103 skin contest
Note: Minify the command to avoid issues :)
MooshroomJockey
Amazing Troll Potion
Shoot The Ender Crystal
PICK UP THE BRICKS
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)