The one my wife went to was David Edelberg, an M.D. in the city, used to be in Lincoln Park, not sure about now. A really good guy.
After avoiding wheat, dairy and eggs for a few years, my wife actually got rid of her allergies using first NAET then BioSet. A guy in the Chicago area who I believe to be a good BioSet practitioner is Harry Hong. He has a website, http://www.harryhong.com. He's also a Chinese medicine doctor trained in China, but actually in many cases prefers BioSet and homeopathy. I believe he's out in the west suburbs, Hoffmann Estates I think.