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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Learn more about Dr. John O'Brien:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (0)

The overall average patient rating of Dr. John O'Brien is Excellent. Dr. O'Brien has been reviewed by 7 patients who have provided 0 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 5.0
Promptness 3.7
Courteous Staff 5.0
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 5.0

Specialties & Research

Dr. John O'Brien, MD is board certified in Surgery.

Education & Awards

Dr. O'Brien graduated from Georgetown University, Washington. He has 1 awards.

Patients' Choice Award (2014)


Dr. O'Brien has 1 hospital affiliations:

  • Newton Memorial Hospital 


  • Spanish
  • English

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Additional Information
Dr. John Gregory O'Brien MD is a male Surgeon, has 33 years of experience and practices in Surgery.
Where does Dr. John G. O'Brien practice?
Dr. John O'Brien has 2 office locations.
Dr. John O'Brien practices Surgery near Newton, NJ.
Additional practice locations include: Sparta, NJ.
See Newton Surgeons.