Dr. Miller is an allergist/immunologist and tenured professor at the University of Texas School of Medicine at San Antonio. She researches the underlying environmental causes of disease and teaches the prevention, diagnosis and treatment of environmentally-induced or exacerbated illnesses. Her work led to the development of the most widely used screening instrument for chemical intolerance, the QEESI, and revealed a new disease process called Toxicant-induced Loss of Tolerance, or TILT.