Video of Dr. Khan’s lecture given at Queen’s University on May 31, 2012. Dr. David A. Khan is Professor of Medicine and Pediatrics at the University of Texas Southwestern Medical Center in Dallas. He is the Program Director for the Allergy & Immunology fellowship program at Southwestern. Dr. Khan is a Past-President of the Texas Allergy, Asthma and Immunology Society. He is also a member of the Joint Task Force on Practice Parameters for Allergy & Immunology. Dr. Khan received his medical degree from the University of Illinois in Chicago. After completing an Internal Medicine residency at the Good Samaritan Medical Center in Phoenix, Arizona he went on to fellowship training in Allergy & Immunology at the Mayo Clinic. His research interests include rush immunotherapy, drug allergy, mood disorders in asthma and alternative therapies for refractory chronic urticaria.