Dr. Nicholson is a physician at the Arizona Asthma and Allergy Institute.  He is board certified by the American Board of Allergy and Immunology and the American Board of Internal Medicine.  He received his medical degree from Oregon Health & Science University in Portland, Oregon.  Following medical school, he completed a residency in Internal Medicine at the University of Hawaii and subsequent fellowship training in Allergy & Immunology at the University of Arizona. Dr. Nicholson enjoys spending time outdoors with his wife and three daughters and has a special interest in classic cars.