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Our Experts

At the Johns Hopkins Cerebral Fluid Center, a team of doctors and advanced practitioners work together to provide the most effective and safest treatments possible for patients with cerebral spinal fluid disorders. The core members of the center include a neurosurgeon, neurologist and geriatrician, as well as advanced practitioners (physician assistants and nurse practitioners).

Center Director

 Research Director


Advanced Practitioners

Jheesoo Ahn

Jheesoo Ahn, M.S.N.

Specialty Neuroscience Nurse

Expertise: Cerebral fluid disorders

Jheesoo Ahn obtained her undergraduate degree in neurobiology and physiology at the University of Maryland, College Park. She has a graduate degree in biochemistry from Virginia Commonwealth University School of Medicine as well as a graduate degree in nursing from the Johns Hopkins University School of Nursing. She worked as a clinical nurse on the neurology and neurosurgery step-down unit at The Johns Hopkins Hospital before joining the Johns Hopkins Cerebral Fluid Center in 2021.

Seema Gulyani, MSN, PhD

Seema Gulyani, M.S.N., Ph.D.

Senior Nurse Practitioner

Expertise: Normal pressure hydrocephalus, evaluation and management. Research interests: NPH biomarkers.

After completing her postdoctoral fellowship in neuroscience at UCLA, Seema Gulyani joined Johns Hopkins University School of Nursing and earned a Bachelor of Science in nursing in 2002. From 2002 to 2005, she worked as a bedside nurse at Johns Hopkins Neurology and Neurosurgery and went on to complete her Master of Science in nursing at the school of nursing in 2010.

Since 2011, Seema has worked as a nurse practitioner with Department of Neurology, seeing patients in movement and sleep disorder clinics. Previously, she pursued her research interests and worked at Johns Hopkins University (2006-2009) and the National Institutes of Health (2015-2017) as a senior research associate. Seema joined the Johns Hopkins Cerebral Fluid Center in 2017 and sees new and follow-up patients with hydrocephalus. She is also among the part-time clinical faculty at the Johns Hopkins University School of Nursing.

Kristina Khingelova, MS, PA-C

Kristina Khingelova, M.S., P.A.-C.

Senior Physician Assistant

Expertise: intracranial hypertension/pseudotumor cerebri, normal pressure hydrocephalus, hydrocephalus, venous sinus stenosis, migraines, cerebrospinal fluid leak

Following the completion of a Bachelor of Science in Nursing program at the University of Delaware in 1999, Kristina Khingelova served as a registered nurse in various hospital settings, including Emory University Hospital and Duke University Medical Center. After graduating with a Master of Science degree from Philadelphia College of Osteopathic Medicine in 2005, Kristina worked as an inpatient hospitalist physician assistant at Johns Hopkins Bayview Medical Center. In 2011, Kristina joined the Cerebrospinal Fluid Disorders Center at Johns Hopkins Bayview Medical Center’s Department of Neurology.

Yadi Xu, M.S., P.A.-C.

Yadi Xu, M.S., P.A.-C.

Physician Assistant

Expertise: hydrocephalus, intracranial hypertension, pseudotumor cerebri, cerebrospinal fluid leak

Yadi Xu is a physician assistant, who completed a bachelor of science degree in health science at Purdue University, followed by a two-year post-baccalaureate research fellowship at the National Institute of Neurological Disorders and Stroke division of the National Institutes of Health. She has published research articles on the development of potential treatments for neuroinflammatory and neurodegenerative conditions, such as multiple sclerosis and amyotrophic lateral sclerosis.

After graduating from Towson University with a master of science degree, she joined the Johns Hopkins Cerebral Fluid Center as a physician assistant. She sees new and follow-up patients with hydrocephalus, intracranial hypertension/pseudotumor cerebri, and cerebrospinal fluid leak.