Dr. Gilligan performs care to patients with pulmonary and respiratory conditions in the inpatient and outpatient settings, and provides care to patients with organ failure of all types in the intensive care unit (ICU) setting. Dr. Gilligan received his medical degree from The University of Texas Health Science Center at San Antonio, his residency training in Internal Medicine from Methodist Medical Center in Dallas, Texas, and completed his subspecialist fellowship training in Pulmonary and Critical Care Medicine at University of Texas Southwestern Medical Center in Dallas.