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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 (2)

The overall average patient rating of Dr. John O'Brien is Average. Dr. O'Brien has been reviewed by 2 patients who have provided 2 comments. The rating is 3 out of 5 stars.

Patient Ratings
Accurate Diagnosis 1.0
Bedside Manner 1.0

Specialties & Research

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

  • He has special expertise in 7 areas:
  • Attention Deficit Disorder (ADD) / Attention Deficit Hyperactivity Disorder (ADHD)
  • Bipolar Disorder / Manic Depressive Disorder
  • Depression
  • Depressive Disorder
  • Insomnia
  • Schizophrenia
  • Sleep Disorders

Education & Awards

Dr. O'Brien graduated from Thomas Jefferson University, Philadelphia.


Dr. O'Brien has 3 hospital affiliations:

  • Thomas Jefferson University Hospital 
  • Thomas Jefferson University Ho, Philadelphia, Pa 
  • Pennsylvania Hosp, Philadelphia, Pa 

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Additional Information
Dr. John Sebastian O'Brien MD is a male Psychiatrist, has 33 years of experience and practices in Psychiatry.
Where does Dr. John S. O'Brien practice?
Dr. John O'Brien has 1 office location.
Dr. John O'Brien practices Psychiatry near Philadelphia, PA.
See Philadelphia Psychiatrists.