If you're trying to solo him as a balance druid with quest greens and blues, here's a strategy that worked for me. Start out outside the room, at max range, in moonkin form. Starfire, moonfire, insect swarm, and wrath, force of nature, a couple more spells, bash him in bear form, start to run, switch to cat and dash into the corner of the church, heal, back to moonkin to dps him down the rest of the way. Occasionally I have to health pot. Killed him every time (8 attempts) so far with less than 8k health.

(I'm getting tanking gear, if you're wondering what the point is)