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Michael Joseph Brennan
Cone Health Medical Group

Michael Joseph Brennan, MD

Specialties and/or Subspecialties

  • Pediatric Endocrinology,
  • Endocrinology
Patient Rating
4.82/5 (Based on 45 Reviews)
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Board-certified in internal medicine, pediatrics, endocrinology and pediatric endocrinology, Michael J. Brennan, MD, is a pediatric and adult endocrinologist. His professional interests include Type 1 and Type 2 diabetes mellitus, thyroid disease, growth disorders, pituitary disorders, adrenal disorders, male and female reproductive endocrinology and bone and mineral metabolism.

After serving in infantry combat during Vietnam, Dr. Brennan went on to become the first U.S. Army physician to complete a five-year combined internal medicine and pediatrics internship and residency. Also, he was the first U.S. Armed Forces physician to complete a three-year specialized fellowship in both pediatric and adult endocrinology.

In 2005, Dr. Brennan, and his wife, a nurse and diabetes educator, established Greensboro’s first ongoing pediatric endocrinology clinic with a unique personalized patient education component. Today, he cares for diverse pediatric and adult endocrinology patients, including those with lifelong congenital or genetic diseases.

A compassionate expert who takes time to truly get to know his patients, Dr. Brennan educates and collaborates with patients to help them live happier, healthier lives. 

In his free time, he enjoys spending time with his wife, four sons and daughters-in-law, and seven grandchildren. His hobbies include history, philosophy and nature.

“I spend time with patients: time to get to know them as people who have medical problems, not just as patients with diseases; time to educate them about their health problems and treatments; and time to support them through their medical problems and life issues. Patients appreciate that time and that personal level of concern and compassion.” – Michael J. Brennan, MD



Medical School

University of Massachusetts Medical School


Walter Reed Army Medical Center, Internal Medicine and Pediatrics


U.S. University of the Health Sciences, Pediatric and Adult Endocrinology
Walter Reed Army Medical Center, Pediatric and Adult Endocrinology

Board Certifications

  • Internal Medicine

  • Pediatrics

  • Pediatric Endocrinology

  • Endocrinology


Provider Review Comments

February 08, 2019
Dr Brennan explained every thing about my health and treated me with respect
February 04, 2019
Dr. Brennan is always cheerful and thorough. He reviews my current medical state in detail and gives suggestions to better my outcomes. I am impressed with his medical knowledge and his dedication to his patients.
February 04, 2019
Dr. Brennan is an exceptionally thorough physician for whom I have the utmost respect
January 21, 2019
January 11, 2019
I have been Dr. Brennan's patient for a number of years. He is consistently thorough in his examination, questions about my history since seeing him last and explaining the results of my labs. I hope he's not retiring any time soon.
December 29, 2018
Awesome dr and staff!
November 25, 2018
Very good provider.
November 13, 2018
*Dr. Brennan is an EXCELLENT doctor. He sits down and explains everything to you.
November 09, 2018
excellent care
October 19, 2018
September 30, 2018
AS always ..Excellent!! He really cares about all his patients
September 29, 2018
*Dr. Brennan is a kind, conscientious professional. I feel lucky to be his patient.
August 24, 2018
*Dr. Michael Brennan is a great doctor! He is very informed and cares about his patients.
August 23, 2018
They don't get any better than this provider.
August 22, 2018
Dr Brennan and staff were very professional
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