About Us

The University of Maryland Sleep Disorders Center treatment team features specialists from a broad range of medical disciplines, which includes the areas of pulmonary diseases, otolaryngology, psychiatry, dentistry, and pediatric and adult neurology.

They work together to provide the best possible care for patients. Below is information on some of the principal team members, all of whom are on the faculty of the University of Maryland School of Medicine.


Steven ScharfSteven M. Scharf, MD PhD

Dr. Scharf is the medical director of the University of Maryland Sleep Disorders Center. He is board certified in internal medicine, pulmonary medicine, and sleep medicine and is a professor of medicine at the University of Maryland School of Medicine. He is responsible for the overall management of the Center, the sleep laboratory and the clinical policies. He is a nationally recognized expert in breathing problems at night and the sleep disturbances in patients with chronic lung diseases.


Samson Z Assefa, MD

Dr Assefa is an Assistant Professor of Medicine at the University of Maryland School of Medicine. He is board certified in internal medicine and board eligible in sleep medicine. He has expertise in treating all aspects of sleep disorders. He has an interest in screening for sleep disordered breathing.


John Brown, MD

Dr. Brown is a pulmonary/critical care specialist with expertise in treating all aspects of sleep disorders. He will be participating in our clinical and research efforts in a variety of sleep disorders. He is board certified in internal medicine, pulmonary medicine, and sleep medicine.


Larry Cohen, MD

Dr. Cohen is the interim vice-chair of the Dept. of General Dentistry at the University of Maryland School of Dentistry. He has an interest in dental sleep medicine, and acts as the primary dental consultant of the University of MD Sleep Disorders Center. He works in the framework of our center in treating patients with mild to moderate obstructive sleep apnea using oral appliance therapy. He has an interest in screening for obstructive sleep apnea in the general dental population.  He lectures at the School of Dentistry on the oral treatment of sleep apnea. 


Montserrat Diaz AbadMontserrat Diaz-Abad, MD

Dr. Diaz is an assistant professor of medicine at the University of Maryland School of Medicine and director of the fellowship program. She is Co-Director of the Maryland ALS Clinic and has particular interest in sleep disordered breathing, effect of neuromuscular disorders on sleep, noninvasive ventilation, and breathing problems and non-invasive ventilation in neuromuscular diseases. She is board certified in internal medicine, pulmonary diseases, critical care medicine, and sleep medicine. She is bilingual in Spanish and English.


Beverly Fang, MD

Dr. Fang is a clinical assistant professor of medicine at the University of Maryland School of Medicine. As a board certified psychiatrist and sleep specialist, Dr. Fang has a wide range of interests in sleep disorders. These include general sleep disorders and sleep disorders in mental health.

Jeffrey Hasday

Jeffrey Hasday, MD

Dr. Hasday is the director of the Division of Pulmonary and Critical Care at the University of Maryland Medical Center. He is board certified in internal medicine and pulmonary diseases and is a professor of medicine at the University of Maryland School of Medicine. He has expertise in breathing problems at night.


Arif Kabir, MD

Dr. Kabir is an assistant professor in the Department of Neurology. He completed an epilepsy and neurophysiology fellowship at the University of California, San Francisco, followed by a sleep medicine fellowship at the San Francisco VA Medical Center. He is board certified in neurology and sleep medicine. He has an interest in the interaction of sleep and neurological disease, with a particular emphasis on sleep disorders in patients with epilepsy.


Ana Lasso-PirotAna Lasso-Pirot, MD

Dr. Ana Lasso-Pirot: Dr. Pirot is Assistant Professor of Pediatrics at the University of Maryland. She is board certified in Pediatrics and Pediatric Lung Diseases. She sees children with disordered breathing at night, including sleep apnea.


Ana Sanchez, MD

Dr. Sanchez is assistant professor of neurology. She completed an epilepsy and neurophysiology fellowship at the University of Maryland Medical Center with a particular emphasis on sleep problems in patients with neurologic disorders, including movement and behavioral disorders as well as epilepsy during sleep.


Rodney Taylor

Rodney Taylor, MD

Dr. Taylor is a member of the Department of Otorhinolaryngology (ear, nose and throat) at the University of Maryland Medical Center and is board certified in this field. He is also an associate professor of surgery at the University of Maryland School of Medicine. He has expertise in the surgical treatment of sleep apnea and swallowing disorders at night.


Avelino VercelesAvelino C. Verceles, MD

Dr. Verceles is a member of Division of Pulmonary and Critical Care at the University of Maryland Medical Center. He is board certified in internal medicine, pulmonary diseases, and sleep medicine. Dr. Verceles is an assistant professor of medicine at the University of Maryland School of Medicine and has expertise in breathing problems at night. His primary research interest focuses on disturbances in circadian rhythm in patients requiring mechanical ventilation.


Emerson Wickwire

Emerson Wickwire, PhD, ABPP, CBSM, FAASM

Dr. Wickwire directs the Insomnia program at the University of Maryland. A frequent speaker, he is a recognized expert in the non-drug treatment of sleep disorders. Dr. Wickwire is board certified in behavioral sleep medicine and cognitive and behavioral psychology. He works closely with all providers on the team in our integrated care model. He carries out behavioral therapy for insomnia that is integrated with a medical evaluation, and has a research interest in the effects of traumatic brain damage on sleep.


Jeffrey WolfJeffrey Wolf, MD

Dr. Wolf is a member of the Department of Otorhinolaryngology (ear, nose and throat) at the University of Maryland Medical Center. He is board certified in this field and is an associate professor of surgery at the University of Maryland School of Medicine. He has expertise in the surgical treatment of sleep apnea.

For more information or to arrange for a sleep consultation for adults, please call 410-706-4771. For children, call 410-706-3285.