That's a tough one--sometimes birds do not like people, but they should never be attacking them. If I were you I would try this: Start off by getting them in the same room. Have the roommate move closer to the bird then give him a treat. Get closer and closer and give him treats and praise all the way. Have the roommate feed it treats so the roommate is associated with good things. If this doesn't work you may need to analyze WHY the bird is acting this way. Is it trying to protect you from the roommate? Does it consider you it's mate and the roomie a threat? Was it mistreated by someone who looked like the roomie in the past? Has it always disliked the roomie or is this a new thing? If it's new, when did it start? What changed then? Is the bird hormonal? Try to look at it from the birds point of view and please, please don't get rid of him because of this. Whatever it is, it's not the bird's fault--they are wild animals. You just have to figure out what's going on in its head. Try googling for bird stores or breeders in your area. My local store has a bird behavioralist on staff who offers help sessions. Give the guy a chance before you rehome him-he will miss his flock badly!