Dr. Jun is a pulmonary, critical care, and sleep medicine physician. He is an expert in the diagnosis and treatment of sleep-disordered breathing, and in the care of critically ill patients in the Medical ICU. He is a member of the Sleep Fellowship Program Evaluation and Clinical Competency Committee and provides teaching to medical students and residents at Johns Hopkins. Dr. Jun is rated as an Elite provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Cerebral Hypoxia, Obstructive Sleep Apnea, Obesity Hypoventilation Syndrome (OHS), and Central Sleep Apnea.

Gregg Semenza is a Pediatrics provider in Baltimore, Maryland. Dr. Semenza is rated as an Elite provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Cerebral Hypoxia, Pulmonary Hypertension, Hypertension, and Anemia.

Paul M. Hassoun, M.D., is professor of medicine at the Johns Hopkins University School of Medicine and the director of the pulmonary hypertension program at Johns Hopkins Hospital. He received his medical degree from the Faculté de Médecine Lariboisière-Saint Louis at the University of Paris, France, completed an internship and residency at Brigham and Women’s Hospital and a fellowship in Pulmonary and Critical Care Medicine at Massachusetts General Hospital, both at Harvard Medical School. He was on faculty in the pulmonary division at New England Medical Center/Tufts University School of Medicine (Tufts-NEMC) in Boston, MA, until 2002 when he joined the division of pulmonary and critical care medicine at Johns Hopkins University. Dr. Hassoun has served or currently serves on numerous American Thoracic Society (ATS) assemblies and committees, including the Pulmonary Circulation Long Range Planning Committee, the Pulmonary Circulation Program Committee (for which he served as chair for 2008-2009), the ATS Scientific Advisory Council, Pulmonary Circulation Leadership Committee, and the American College of Chest Physicians Vascular Steering Committee. He served as the ATS Pulmonary Circulation chair (2011-2012) and on the ATS Publications Policy Committee. He was recently elected president of the Pulmonary Vascular Research Institute (PVRI; 2018-2019). Dr. Hassoun has held numerous editorial activities including serving on the editorial board of the American Journal of Respiratory and Critical Medicine (2010 to present), CHEST (2006-2015) and the European Respiratory Review (2008-2015). He currently serves as associate editor of the European Respiratory Journal (2013-present) and has served as associate editor for the Journal of Clinical Investigation (2017-2022). Dr. Hassoun is rated as a Distinguished provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Pulmonary Hypertension, Systemic Sclerosis (SSc), Pulmonary Veno-Occlusive Disease, Cerebral Hypoxia, and Lung Transplant.

Dr. Pham is a physician who specializes in pulmonary, critical care, and sleep medicine. He provides care for critically ill patients in the Medical ICU. His clinical focus is in the diagnosis and management of sleep-disordered breathing. He provides teaching to medical students, residents, and fellows at Johns Hopkins. Lab Website Polotsky Research Lab - Lab Website Research Summary Dr. Pham’s research focus is on the mechanisms and impact of sleep disordered breathing, with a particular emphasis on the role of hypoxia. His research interests have led him to the highlands of Peru, where he collaborates extensively with the CRONICAS cohort investigators to characterize the impact of hypoxia on respiratory patterns, cardiovascular responses and metabolism. He is currently involved in developing low-cost readily deployable strategies to treat sleep disordered breathing at high altitude. He has also pursued his research interests by modeling the metabolic impact of ambient hypoxia in the sleep lab. As a member of the leadership of the Center for Interdisciplinary Sleep Research and Education (CISRE), he is committed to improving investigators’ access to sleep recording and data analysis. Dr. Van Pham is rated as a Distinguished provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Obstructive Sleep Apnea, Cerebral Hypoxia, Central Sleep Apnea, and Obesity Hypoventilation Syndrome (OHS).

Pediatric and neonatal neurologist Joseph Scafidi is a clinician-scientist with expertise in pre-term neonatal brain injury, hypoxic ischemia and neurodevelopmental disorders. He directs the Michael V. Johnston Center for Developmental Neuroscience at Kennedy Krieger Institute. Dr. Scafidi earned a degree in osteopathic medicine from the Philadelphia College of Osteopathic Medicine. He completed residency training in pediatrics at Rutgers University Medical School as well as in child neurology at Children’s National Hospital, where he also undertook fellowship training in neonatal neurology. Additionally, Dr. Scafidi was a postdoctoral research fellow in developmental neurobiology at Children’s National Research Institute. His research interests focus on understanding metabolic adaptations after perinatal brain injury in the acute and long-term recovery phases, specifically how different cell populations in different brain regions use energy after injury and how these adaptations or maladaptations affect the recovery process. As a practicing pediatric and neonatal neurologist, Dr. Scafidi is ideally positioned to facilitate bench-to-bedside therapies through his laboratory and to improve knowledge of disease by developing and testing bedside-to-bench, research-driven hypotheses. Dr. Scafidi is rated as a Distinguished provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Cerebral Hypoxia, Seizures, Benign Rolandic Epilepsy, Premature Infant, and Endovascular Embolization.

Dr. Eric McCollum is a pediatric pulmonologist at the Johns Hopkins School of Medicine. He has expertise in global child respiratory health with more than ten years of clinical and research experience in low-resource settings in southern Africa and south Asia. After having lived in Malawi for five years as a clinician with the Baylor Pediatric AIDS Corps and as a NIH Fogarty International Clinical Research Fellow, Dr. McCollum is now primarily based in the countries of Lesotho and Bangladesh. He is the principal investigator of a NIH K01 International Research Scientist Development Award, through the Fogarty International Center, examining the role of pulse oximetry in Bangladeshi children with clinical pneumonia. Dr. McCollum is also a co-investigator for a study comprehensively examining the effectiveness of the pneumococcal conjugate vaccine in rural Bangladeshi children. In the southern African country of Malawi Dr. McCollum is the principal investigator of a randomized controlled trial investigating the effectiveness of bubble continuous positive airway pressure in children hospitalized with severe clinical pneumonia. He has successfully designed, led, or co-led several multi-site studies in developing countries throughout Africa and Asia including the novel application of pulse oximetry for children with clinical pneumonia by rural Malawian frontline health workers and digital auscultation as a respiratory diagnostic in six low-resource countries participating in the Pneumonia Etiology Research for Child Health study. Dr. McCollum has been recognized globally for his contributions to child respiratory health. He has won multiple early career investigator awards and is currently a member of the World Health Organization Technical Support Network for pneumococcal conjugate vaccine impact studies and a member of the World Health Organization expert global working group for the World Health Organization chest radiograph guidelines for children. He holds a joint faculty appointment in the Department of International Health at the Johns Hopkins School of Public Health. Dr. Mccollum is rated as a Distinguished provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Cerebral Hypoxia, Malnutrition, HIV/AIDS, and Infantile Pneumothorax.

Alan Schwartz is a Pulmonary Medicine specialist and a Sleep Medicine provider in Towson, Maryland. Dr. Schwartz is rated as a Distinguished provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Obstructive Sleep Apnea, Central Sleep Apnea, Cerebral Hypoxia, Endoscopy, and Adenoidectomy. Dr. Schwartz is currently accepting new patients.

Ari Zaiman is an Intensive Care Medicine provider in Towson, Maryland. Dr. Zaiman is rated as an Advanced provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Cerebral Hypoxia, Pulmonary Hypertension, Lung Metastases, Chronic Obstructive Pulmonary Disease (COPD), and Endoscopy.

Dr. Howard Steiner is an instructor of medicine at the Johns Hopkins School of Medicine. He has been practicing pulmonary and sleep consultative medicine since 1989. In his role as a diagnostician, he guides the evaluation and management of respiratory problems including infectious, malignant, allergic, autoimmune, and sleep-related disorders. He has been part-time faculty in the Johns Hopkins Pulmonary Division since 1991, is a Fellow in the American College of Chest Physicians, and mentors medical students, residents, and pulmonary fellows training at the Johns Hopkins Hospital. Contact for Research Inquiries 10755 Falls Road Pavilion I, Suite 200 Lutherville, MD 21093 Phone: (410) 583-7124 Selected Publications Lwebuga-Mukasa JS, Steiner H. Monoclonal antibody to rat lung Maclura Pomifera agglutinin (MPA) lectin binding glycoprotein localizes apically on rat and human type II pneumocytes and Clara cells. J Cell Biol 107:71a, 1989. Roberts PJ, McBean GJ, Steiner H, Kohler C, Schwarcz R. Lesioning Effects of Ibotenate in the immature rat brain and protection by 2-amino-7 phosphonoheptanoic acid. Soc Neurosci Abst 9:261, 1983. Steiner H, Ingbar DI. Mechanisms of lung injury and repair. In: Matthay RA, Matthay MA, Wiedemann HP eds. Annual Review of Pulmonary and Critical Care Medicine. Hanley & Belfus (Philadelphia, 1989), pp 205-223. Steiner H, Lwebuga-Mukasa JS. A549 cells display distinct functional and morphologic properties depending on their culture substratum. J Cell Biol 107:71a, 1989. Steiner H, Lwebuga-Mukasa JS. A549 cells produce a factor which is Mitogenic for human lung fibroblasts. Amer Rev Resp Dis 139:A492 1989. Steiner H, McBean GJ, Kohler C, Roberts PJ, Schwarcz R. Ibotenate Induced neuronal degeneration in immature rat brain. Brain Research 307:117-124, 1984. Dr. Steiner is rated as an Experienced provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Bronchiectasis, Obstructive Sleep Apnea, Lung Metastases, and Interstitial Lung Disease.

Ziad K Mirza is a primary care provider, practicing in Undersea and Hyperbaric Medicine in Towson, Maryland. Dr. K Mirza is rated as an Experienced provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Peptic Ulcer, Type 2 Diabetes (T2D), Chronic Recurrent Multifocal Osteomyelitis, and Cerebral Hypoxia.

Bobby Mathew is an Intensive Care Medicine provider in Baltimore, Maryland. Dr. Mathew is rated as an Experienced provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Cerebral Hypoxia, Hypovolemic Shock, Inappropriate Sinus Tachycardia (IST), Gastrostomy, and Colonoscopy.

William Karkowsky is an Intensive Care Medicine provider in Baltimore, Maryland. Dr. Karkowsky is rated as an Experienced provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Pulmonary Aspergilloma, Allergic Bronchopulmonary Aspergillosis, Bronchiectasis, and Aspergillosis.

Matthew Woodford is an Intensive Care Medicine provider in Towson, Maryland. Dr. Woodford has been practicing medicine for over 18 years and is rated as an Experienced provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Emphysema, Bullae, Pneumonia, and Acute Interstitial Pneumonia.

Elisabeth Carr is an Intensive Care Medicine provider in Towson, Maryland. Dr. Carr is rated as an Experienced provider by MediFind in the treatment of Cerebral Hypoxia. Her top areas of expertise are Neurosarcoidosis, Sarcoidosis, Lung Metastases, Colonoscopy, and Endoscopy.

Donald Slack is an Intensive Care Medicine provider in Baltimore, Maryland. Dr. Slack is rated as an Experienced provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Pneumonia, Lung Metastases, Interstitial Lung Disease, Thyroidectomy, and Advanced Bronchoscopy.

Linda Barr is an Intensive Care Medicine provider in Towson, Maryland. Dr. Barr is rated as an Experienced provider by MediFind in the treatment of Cerebral Hypoxia. Her top areas of expertise are Lung Metastases, Bronchiectasis, Asthma, Gastrostomy, and Endoscopy.

Mitchell Schwartz is a Pulmonary Medicine provider in Towson, Maryland. Dr. Schwartz is rated as an Experienced provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Lung Metastases, Hospital-Acquired Pneumonia, Atypical Pneumonia, Neurosarcoidosis, and Gastrostomy.

Madhat Arnouk is an Intensive Care Medicine provider in Towson, Maryland. Dr. Arnouk is rated as an Experienced provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Obstructive Sleep Apnea, Chronic Obstructive Pulmonary Disease (COPD), Lung Metastases, Hospital-Acquired Pneumonia, and Gastrostomy.

William Han is an Intensive Care Medicine provider in Baltimore, Maryland. Dr. Han is rated as an Experienced provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Lung Metastases, Chronic Obstructive Pulmonary Disease (COPD), Lung Cancer, Lymphofollicular Hyperplasia, and Advanced Bronchoscopy.

Ashwin Dharmadhikari is an Intensive Care Medicine provider in Baltimore, Maryland. Dr. Dharmadhikari is rated as an Experienced provider by MediFind in the treatment of Cerebral Hypoxia. His top areas of expertise are Pulmonary Tuberculosis, Cerebral Hypoxia, and Gastrostomy.