What he taught: Defense Against the Dark Arts
Why he landed here: Even when Barty was posing as Mad-Eye Moody, he was actually, uh, a really good Dark Arts professor. Sure, he taught the Unforgivable Curses to the class, but, in his defense, he gave students the option to leave if they didn't want to learn it. And, honestly, it's better than Umbridge not even touching the subject, right? At the end of the day, he taught his students A LOT...even it was *technically* illegal.