Stefano Guerra, MD, PhD, is a professor of Medicine, the Director of the Population Science Unit at the Asthma and Airway Disease Research Center, and a leading expert in the natural history and biomarkers of obstructive lung diseases, including asthma and chronic obstructive pulmonary disease (COPD). As principal investigator, he is engaged in the leadership and coordination of multiple studies that use bio-specimens and phenotypic information from independent epidemiological cohorts to characterize the natural history, profile the risk factors, and identify novel biomarkers of lung diseases.