Harrison's Principles of Internal Medicine, (4 vol ) 21st Edition

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Joseph Loscalzo, MD, PhD, is Hersey Professor of the Theory and Practice of Medicine at Harvard Medical School, Chairman of the Department of Medicine, and Physician-in-Chief at Brigham and Women's Hospital. 
Anthony S. Fauci, MD, is Chief of the Laboratory of Immunoregulation and Director of the National Institutes of Allergy and Infectious Diseases for the National Institutes of Health.
Dennis L. Kasper, MD, is William Emery Channing Professor of Medicine and Professor of Microbiology and Molecular Genetics at Harvard Medical School. 
Stephen L. Hauser, MD, is Robert A. Fishman Distinguished Professor of Neurology and Director of the UCSF Weill Institute for Neurosciences for the University of California, San Francisco.
Dan L. Longo, MD, is Professor of Medicine at Harvard University School of Medicine and Deputy Editor of Oncology for the New England Journal of Medicine.
J. Larry Jameson, MD, PhD, is Robert G. Dunlop Professor of Medicine; Dean of Raymond and Ruth Perelman School of Medicine; and Executive Vice President of the University of Pennsylvania for the Health System.

Dennis L. Kasper, MD, MA (Hon)William Ellery Channing Professor of MedicineProfessor of Microbiology and Molecular GeneticsExecutive Dean for Academic ProgramsHarvard Medical SchoolDirector, Channing LaboratoryDepartment of MedicineBrigham and Women’s Hospital

Anthony S. Fauci, MDChief, Laboratory of ImmunoregulationDirector, National Institute of Allergy and Infectious DiseasesNational Institutes of Health. In 2008, Dr. Fauci was awarded the Presidential Medal of Freedom, the Nation's highest civil award.