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John O'Brien Clarke, III, M.D.

Associate Professor of Medicine


Appointment Phone


Main Location

The Johns Hopkins Hospital

Out-of-State & International Patients +
Out of State Patients

Call 410-464-6641 (8a.m. to 6p.m., EST, Mon-Fri)

Learn more about our out-of-state patient services »

International Patients

Call +1-410-502-7683 (7a.m. to 6p.m., EST, Mon-Fri)

Learn more about our international patient services »


  • Associate Professor of Medicine



The Johns Hopkins Hospital

Appointment Phone: 410-933-7495

600 N. Wolfe Street
Sheikh Zayed Tower
Baltimore, MD 21287 map
Phone: 410-955-9696

Johns Hopkins Medicine - Green Spring Station

Appointment Phone: 410-828-3585

Green Spring Station
2360 W. Joppa Road
Suite 200
Lutherville, MD 21093 map
Phone: 410-828-3585


Achalasia, Barrett's Esophagus, Burping, Belching, Clinical Gastroenterology, Constipation, Digestive Diseases, Eosinophilic Esophagitis, Esophageal Disease, Gastroenterology, Gastroesophageal Reflux Disease (GERD), Gastroparesis, Heartburn, Hiccups, Hoarseness, Motility Disorders, Nausea, Neurogastroenterology, Rectal Problem, Reflux and Burning, Stomach Ulcer, Swallowing Disorders, Vomiting


Dr. John OBrien Clarke is an Assistant Professor of Medicine in the Division of Gastroenterology at The Johns Hopkins Hospital. His clinical and research interests include dysphagia (swallowing disorders), gastroesophageal reflux disease, esophageal motility, eosinophilic esophagitis, gastroparesis and other gastrointestinal motility disorders.

He completed undergraduate training at Brown University in Providence, Rhode Island and received his medical degree (M.D.) from Columbia University in New York City. He completed internship and residency in Internal Medicine at The Johns Hopkins Hospital. He then worked for 2-years as a Hospitalist before completing Gastroenterology Fellowship at The Johns Hopkins Hospital.

In addition to routine fellowship training, Dr. Clarke also worked for several months with Dr. Peter Kahrilas at Northwestern University in Chicago, Illinois, pursuing advanced training in the field of esophageal motility. Dr. Clarke is currently the Director of Esophageal Motility at The Johns Hopkins Hospital. more

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