Dr. Horwitz received a B.S. degree in biochemistry from the University of Illinois, and a PhD in Immunology and Molecular Biology from the University of Florida. He received his MD from the University of Illinois, and completed his residency in Internal Medicine at University Hospitals (Case Western Reserve University) in Cleveland. He was a post-doctoral fellow at the National Institutes of Health studying rheumatologic disorders, followed by a three-year fellowship in Allergy and Clinical Immunology at the University of Wisconsin at Madison, where he specialized in asthma and allergic disease management. He then served as a Clinical Assistant Professor in the Department of Medicine at the University of Wisconsin, and at the VA Medical Center, in Madison. He completed a two-year fellowship in Integrative Medicine at the University of Arizona in 2003. Dr. Horwitz provides integrative medical consultations to people with a variety of medical concerns, with a special interest in complementary and alternative therapies for asthma and immunological/allergic diseases, as well as hepatitis and heart disease.