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Michael Joseph Brennan
Cone Health Medical Group

Michael Joseph Brennan, MD

Specialties and/or Subspecialties

  • Pediatric Endocrinology,
  • Endocrinology
Patient Rating
4.71/5 (Based on 33 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

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
August 17, 2018
Dr Brennan has been my doctor for a good many years, he is very thorough and very compassionate, if i need him for anything, all i need to do is call him,, i drive 110 miles to see Dr Brennan for a very good reason
August 15, 2018
I have been seeing Dr. Brennan for years. He has always took very good care of me and he has always took his time in treating me and explaining things to me. Since he has been with Cone Health, I have always received very good treatment from the staff.
August 07, 2018
July 25, 2018
Dr. Michael Brennan is at the very top of doctors that has ever followed and cared for me. He is so knowledgeable and kind and understanding. He truly is the best endocrinologist around and extremely worth the 2 hour drive to see him for my appointments.
July 24, 2018
*Dr. Brennan has always been helpful and understanding. He's great.
July 20, 2018
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