If they are going strictly medical, the best drs are the reproductive endocrinologists at the University of Utah. I've heard good things about Dr. Hatasaka (sp?).
If they are interested in a more natural approach, there is a naturopath/medical herbalist in New Zealand, Dr. Brad Crouch, who is in Utah frequently. His specialty is infertility and if/when I ever get the money, I'm hoping to use him. His website is www.infertilitysolutions.com
Hope this helps.