Dan Belz, MD

Dr. Neptune is a pulmonary, critical care physician with expertise in genetic disorders of the matrix with pulmonary manifestations. She is also skilled in the management of patients with advanced obstructive lung disease, especially emphysema. Dr. Neptune has extensive expertise in the diagnosis and management of the pulmonary complications of Marfan Syndrome, Loeys-Dietz Syndrome, vascular Ehlers Danlos Syndrome and other matrix disorders and serves on the Professional Advisory Board of the Marfan Foundation. She is also an expert on tobacco dependence and is the Vice-Chair of the Tobacco Action Committee of the American Thoracic Society. Dr. Neptune earned her M.D. from Harvard Medical School. She completed her residency and performed a fellowship in pulmonary and critical care at the University of California, San Francisco. She also performed a fellowship in genetics at Johns Hopkins. Her research interests include therapeutic strategies in Marfan syndrome; mechanisms and prevention of progression of COPD; and hepatocyte growth factor signaling in airspace homeostasis. Dr. Neptune is committed to creating a diverse research community and clinical workforce. She is involved in multiple diversity initiatives at Johns Hopkins and the American Thoracic Society. She is also involved in increasing awareness of tobacco dependence and the needed regulatory policies.Dr. Neptune serves on the Compliance Compensation Subcommittee for the Department of Medicine.

Dr. Sarath Raju is an instructor of medicine at the Johns Hopkins University School of Medicine. His areas of clinical expertise include obstructive lung diseases (asthma, chronic obstructive pulmonary disease), chronic lung disease in persons living with HIV, and critical care medicine.Dr. Raju earned his M.D. from Rush Medical College. He completed his residency at Johns Hopkins, where he also performed a fellowship in pulmonary and critical care medicine. He previously served as an Assistant Chief of Service for the Osler Medical Housestaff Training Program at Johns Hopkins.Dr. Raju joined the Johns Hopkins faculty in 2020, and is supported by the NIH to conduct research investigating the intersection of HIV, environmental exposures, and lung health.

Dr. Philip Seo is an Associate Professor in the Division of Rheumatology. A graduate of Harvard College and the College of Physicians and Surgeons at Columbia University, Dr. Seo completed his Internal Medicine training as a member of the Osler Medical Service at the Johns Hopkins Hospital. Since then, he has worked at Johns Hopkins in several capacities, including as a hospitalist at Johns Hopkins Bayview Medical Center, and as an Assistant Chief of Service of the Department of Medicine at the Johns Hopkins Hospital, before joining the Division of Rheumatology.Dr. Seo is the Director of the Johns Hopkins Vasculitis Center and Director of the Johns Hopkins Rheumatology Fellowship Program. His clinical interests lie in the assessment and treatment of patients with systemic vasculitis, in particular, the ANCA-associated vasculitides, which include granulomatosis with polyangiitis, microscopic polyangiitis, and eosinophilic granulomatosis with polyangiitis.