Igor Barjaktarevic, M.D., Ph.D., is an Associate Professor at the David Geffen School of Medicine at UCLA and works at Ronald Reagan Medical Center, both in Los Angeles, California. He graduated from medical school at the University of Belgrade in Serbia, completed his residency in internal medicine at New York University School of Medicine in New York, and completed his pulmonary and critical care fellowship at Cornell University at New York Presbyterian Hospital in New York. Dr. Barjaktarevic received his Ph.D. in pulmonary immunology in 2016. His research is focused on chronic obstructive pulmonary disease (“COPD”), AATD, lung nodule/lung cancer, and the use of ultrasound in critical care.