Dr. Horwitz is Professor of Medicine and Microbiology, Immunology, & Molecular Genetics. He received his M.D. degree from Columbia U. College of Physicians and Surgeons and subsequently trained in Internal Medicine and Infectious Diseases at the Albert Einstein College of Medicine. He served for two years as an Epidemic Intelligence Officer at the CDC and then trained in cellular physiology and immunology at The Rockefeller University. From 1980-85, he was on the faculty of The Rockefeller University as an Assistant Professor and Associate Physician. In 1985, he joined the faculty of UCLA as Professor of Medicine and of Microbiology, Immunology & Molecular Genetics and as Chief of the Division of Infectious Diseases, a position he held until 1992. Dr. Horwitz is a fellow in the Infectious Diseases Society of America and a member of the American Society for Clinical Investigation. His awards include the Squibb Award from the Infectious Diseases Society of America and election to Fellowship in the American Association for the Advancement of Science. His research has focused on intracellular parasitism, especially the immunobiology of the etiologic agents of Legionnaires' disease, leprosy, tuberculosis, and tularemia.