Dennis A. Ausiello, MD, is the Jackson Professor of Clinical Medicine at Harvard Medical School and the Physician-in-Chief, Emeritus of the Department of Medicine at Massachusetts General Hospital. Previously, Dr. Ausiello served as Physician-in-Chief of the Department of Medicine at MGH from 1996-2013, and as the Chief of the Renal Unit at MGH from 1983-1996. He is a renowned cell biologist and has made a substantial contribution to the knowledge of epithelial biology in the areas of membrane protein trafficking, ion channel regulation, and signal transduction. Dr. Ausiello has published over 150 papers, chapters, and textbooks and serves as the co-editor of Cecil's Textbook of Medicine (Elsevier), now in its 23rd edition. A nationally recognized leader in academic medicine, Dr. Ausiello was elected to the Institute of Medicine of the National Academy of Sciences in 1999 and the American Academy of Arts and Sciences in 2003.