Harrison’s Principles of Internal Medicine - 20th Edition: - Volume I & Volume II About the Author J. Larry Jameson, MD, PhD Robert G. Dunlop Professor of Medicine; Dean, Raymond and Ruth Perelman School of Medicine; Executive Vice President, University of Pennsylvania for the Health System, Philadelphia, Pennsylvania. Anthony S. Fauci, MD Chief, Laboratory of Immunoregulation; Director, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland. Dennis L. Kasper, MD William Ellery Channing Professor of Medicine and Professor of Microbiology and Immunobiology, Division of Immunology, Department of Microbiology and Immunobiology, Harvard Medical School, Boston, Massachusetts. Stephen L. Hauser, MD Director, UCSF Weill Institute for Neurosciences; Robert A. Fishman Distinguished Professor, Department of Neurology, University of California, San Francisco, San Francisco, California. Dan L. Longo, MD Professor of Medicine, Harvard Medical School; Senior Physician, Brigham and Women’s Hospital; Deputy Editor, New England Journal of Medicine, Boston, Massachusetts. Joseph Loscalzo, MD, PhD Hersey Professor of the Theory and Practice of Medicine, Harvard Medical School; Chairman, Department of Medicine; Physician-in-Chief, Brigham and Women’s Hospital, Boston, Massachusetts.