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John Harmon, M.D.

Photo of Dr. John Harmon, M.D.

Director, Surgical Research

Professor of Surgery


Languages: English, French

Expertise: Breast Cancer, Breast Disease, Burns, Cancer, Diseases of the Small Bowel and Colon, General Surgery, Hernias, Parathyroid Diseases, Stomach Cancer, Surgery, Thyroid, Thyroid Diseases, Wound Healing more

Research Interests: pathophysiology of gastro-esophageal diseases; Surgical wound healing

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Johns Hopkins Bayview Medical Center
Appointment Phone: 410-550-0400

4940 Eastern Avenue
Baltimore, MD 21224 map

The Johns Hopkins Hospital (Main Entrance)
Appointment Phone: 443-997-1508

1800 Orleans St.
Sheikh Zayed Tower
Baltimore, MD 21287 map

Johns Hopkins Outpatient Center
Appointment Phone: 443-997-1508

601 N. Caroline St.
Baltimore, MD 21287 map
Phone: 410-550-0401
Fax: 410-550-1245


John W. Harmon, M.D., FACS, is a general surgeon with a wide-ranging practice including a variety of complex clinical problems, Dr. Harmon specializes in the management of complex hernias and wounds. However, his many surgical interests include hernias, wound healing, breast cancer, colon and small bowel cancers, stomach cancer, as well as thyroid and parathyroid conditions.

Dr. Harmon has been featured in several publications regarding the gastrointestinal organs, including the esophagus, stomach, small intestine and colon. He has also published information dealing with military medicine, specifically blast injuries. Dr. Harmon was one of the first to publish, in his paper on Zollinger Ellison syndrome, the importance of removing tumors. He also was the first to observe an endocrine effect of marijuana. His animal studies of GERD (gastro-esophageal reflux disease) were extensive and helped explain the pathophysiology of the condition. more


  • Director, Surgical Research
  • Professor of Surgery

Centers & Institutes



  • MD; Medicine, Columbia University College of Physicians and Surgeons (1969)


  • Boston City Hospital / Surgery (1975)


  • Lahey Clinic / Gastroenterology (1973)

Board Certifications

  • American Board of Surgery / Surgery (1976)

Research & Publications


View his lab website at

Patient Ratings & Comments

The Patient Rating score is an average of all responses to physician related questions on the national CG-CAHPS Medical Practice patient experience survey through Press Ganey. Responses are measured on a scale of 1 to 5, with 5 being the best score. Comments are also gathered from our CG-CAHPS Medical Practice Survey through Press Ganey and displayed in their entirety. Patients are de-identified for confidentiality and patient privacy.

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