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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).

Patient Reviews

Patient comments (4)

The overall average patient rating of Dr. Brian O'Leary is Excellent. Dr. O'Leary has been reviewed by 18 patients who have provided 4 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.3
Promptness 4.8
Courteous Staff 4.9
Accurate Diagnosis 4.8
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 5.0

Specialties & Research

Dr. Brian O'Leary, MD is board certified in Internal Medicine.

Education & Awards

Dr. O'Leary graduated from Northwestern University, Chicago. He has 5 awards.

Castle Connolly's Top Doctors™ (2012 - 2013)
Patients' Choice Award (2012, 2014)
Compassionate Doctor Recognition (2012, 2014)
Top 10 Doctor - City (2014)
Naperville, IL
On-Time Doctor Award (2014)


Dr. O'Leary has 3 hospital affiliations:

  • Advocate Good Samaritan Hospital 
  • Edward Hospital 
  • Advocate Hope Childrens Hospital 


  • French

> > > > Dr. Brian O'Leary, MD

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Additional Information
Dr. Brian Michael O'Leary MD is a male Internist, has 27 years of experience and practices in Internal Medicine.
Where does Dr. Brian M. O'Leary practice?
Dr. Brian O'Leary has 7 office locations.
Dr. Brian O'Leary practices Internal Medicine near Naperville, IL.
Additional practice locations include: Plainfield, IL and Hinsdale, IL.
See Naperville Internists.