Andy Stein (better known by his stage name MandoPony) is a shitty amateur musician who makes fan music for My Little Pony and lives in his mother's basement. Also known as MandoPedo, BlandoPony, Mama's Boy Mando, and "The Man Who Fucked Michelle Creber", he has done absolutely nothing useful with his life and is only known in the brony community because he is a huge drama queen and regularly brown-noses all of the people who work on the show.
While Mandopony has made more than his share of god-awful brony music, his most notable claim to fame so far has been overreacting horribly to internet rumours that he's a pedophile (which happen to be true).