Dr. Hansen-Flaschen holds a B.A. from Brown University, and an M.D. from New York University. He completed an Internal Medicine Residency, and Pulmonary and Critical Care Fellowships, all at the University of Pennsylvania.

Dr. Hansen-Flaschen is the Paul F. Harron Jr. Family Professor of Medicine and the Chief of Pulmonary, Allergy and Critical Care Division in the Perelman School of Medicine at the University of Pennsylvania. His clinical specialties are Adult Cystic Fibrosis & Brochiectasis, Chronic Obstructive Pulmonary Disease, Interstitial Lung Disease & Sarcoidosis, Medical Critical Care, and Pulmonary Diagnosis & Second Opinion. Dr. Hansen-Flaschen was recently was awarded the Leonard Tow Humanism in Medicine Award.