Being the first in his immediate family to go to college, Dr Weg continued advancing his education and received his MD from New York Medical College, completing his medical training at Walter Reed General Hospital and Wilford Hall USAF Hospital. After his pulmonary training, he became Chief of the Pulmonary Section and then Chief, Pulmonary and Infectious Disease Services, at Wilford Hall. From there, he spent the next 4 years in Houston teaching at Baylor College of Medicine and serving as Clinical Director of the Pulmonary Disease Division at Jefferson Davis Hospital. He and his staff were responsible for revitalizing the Jefferson Davis facility in Houston, working with a large TB ward and introducing clinical pulmonary medicine into the facility. In September 1971, Dr Weg began his distinguished career of > 40 years at the University of Michigan in Ann Arbor, where he served as Chief of the Division of Pulmonary and Critical Care Medicine from 1974 to 1985 and Professor Emeritus of Internal Medicine in the Division of Pulmonary and Critical Care Medicine from 2001 until his death. Among his many honors and awards is a gift from his former fellows—the naming of the John G. Weg, MD, Pulmonary and Critical Care Medicine Library at the University of Michigan. Dr Weg’s leadership and involvement with an extraordinary number of committees and volunteer organizations, along with his exhaustive bibliography, attest to his enthusiasm and dedication to education and training in pulmonary and critical care medicine and advancing the field of medicine. At a time when there was very little training in how to do it, he advised physicians to learn how to do research and seek out lectures or courses on the subject, such as those he established at Michigan.