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Dr. Weiss is the chief of the Division of Pulmonary, Critical Care and Sleep Medicine at Beth Israel Deaconess Medical Center, and is a professor of medicine at Harvard Medical School. He is also the founder of the Harvard Medical School Division of Sleep Medicine and he remains a member of that Division’s Executive Committee. Dr. Weiss is active clinically on the Medical Intensive Care Service at Beth Israel Deaconess. His research focuses on the cardio-respiratory consequences of intermittent hypoxia and arterial pressure control in patients with obstructive sleep apnea. The laboratory uses human volunteers to examine causes of susceptibility to sleep apnea of cyclic intermittent hypoxia induced hypertension, and the laboratory uses animal models to study molecular pathways contributing to sustained chemoreflex hypersensitivity and its contribution to elevated arterial pressure after cyclic intermittent hypoxia.