This is a really good link about allergists, but allergists are not the only specialists for asthma. The site itself is full of good info, so don't forget to click on the other pages and links there.

This is a really good article about what an Allergist does, but it relates more to allergies than asthma. I would have liked to see more information on how an Allergist helps with asthma and then suggestions for other types of physicians and how the treatment would differ from physician to physician.