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Michael J. Brennan
Cone Health Medical Group

Michael J. Brennan, MD

Specialties and/or Subspecialties

  • Pediatric Endocrinology,
  • Endocrinology,
  • Pediatrics
  • Pediatric Endocrinology
Patient Rating
4.9/5 (Based on 83 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

October 24, 2021
Experience was good as usual
September 08, 2021
Dr. Brennan is extremely intelligent and I trust his opinion about our son's endocrine issues. He is direct and honest, while still compassionate and is optimistic without giving false hope. He is soft spoken and you can just tell how much he loves his job and the children he works with.
August 03, 2021
Dr Brennan a well informed doctor concerning diabetes and explains all aspects of my care to me
July 26, 2021
Dr Brennen is excellent.
July 18, 2021
Dr. Brennan always goes above and beyond to help my son and I to understand to help with details on improving our A1c and over all health. This is a rarity of having dr's like him to help us like this. We travel over 2 hrs to get this kind of care of us.
June 21, 2021
good experience
May 15, 2021
Dr. Brennan is caring, engaged & committed to excellence.
March 10, 2021
Good experience
February 26, 2021
Dr Brennan always listens and answers my questions. Very thorough visit.
February 24, 2021
All positive.
February 22, 2021
I have been Dr. Brennan's patient for 15 years; he is a consummate professional in all aspects of my health care.
January 30, 2021
Dr Brennan has been amazing! We've been seeing him since a new provider joined our pediatricians office and noticed that my youngest son had had no growth at all in 3 years! Someone should have noticed this since we've been there numerous times with him complaining of stomach pain, nausea, headaches and other symptoms. He has been great at explaining things sho that we understood exactly what was going on and to me there I'd nothing better when it comes til your children
January 27, 2021
Great Doctor and staff!
January 15, 2021
Excellent doctor. Would certainly recommend him to others.
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