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Michael J. Brennan
Cone Health Medical Group

Michael J. Brennan, MD

Specialties and/or Subspecialties

  • Pediatric Medicine,
  • Pediatrics
Patient Rating
4.9/5 (Based on 65 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

May 28, 2022
Very good he explains so that u can understand
April 16, 2022
Dr Brennen is competent, kind and patient.
March 31, 2022
Good service
March 27, 2022
Dr Brennan is very knowable about my health and I have been seeing him for 22 years
March 03, 2022
All good.
February 28, 2022
Dr. MJ Brennan has always been and remains an exceedingly outstanding physician; very caring and professional.
February 28, 2022
I can't say enough good things about Dr Brennan. He is exceptional. Always listens, is thorough, extremely knowledgeable, offers solutions and follows through.
February 07, 2022
Wish all doctors were like Dr. Brennan he is wonderful.
December 26, 2021
I have always received excellent care from Doctor M. Brennan.
October 24, 2021
Experience was good as usual
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