Meet Dr. Mary C. Brennan

I knew early in high school that I wanted to be a physician. My desire came from watching my parents struggle with health issues. As I progressed through medical school, I knew that pediatrics was the field for me. I wanted to partner with parents or caregivers in a way to help them find the right path. I'm passionate about providing parents and then older children/teens with information and recommendations that can help them thrive physically and mentally.

I attended LSU in Baton Rouge for undergraduate, and then to LSU School of Medicine in New Orleans. I studied pediatrics at Baylor College of Medicine and Texas Children's Hospital in Houston.

In 1990 I moved to Fort Worth and opened my private practice with Deborah Hucaby M.D. When Cook Children's formed the physician network, we were one the original practices to join. Shortly, after that Dr. Alice Phillips joined me in our current practice.

As a pediatrician, I'm blessed to see the children move from total dependency to independence through childhood to adolescence.

When not at work, I love spending time with my three sons. We love being outdoors with our 3 dogs, riding bikes along the many trails in Fort Worth, volunteering at our church, or trying out new hobbies - like fly fishing.

Dr. Carol Mary Brennan is an amazing doctor. She has great bedside manner and makes sure that we leave with knowledge and they we're comfortable with the recommendations, suggestions or medication she gave us. Thank you. – Patient family

Services

  • Acute illnesses
  • ADHD management
  • Allergy treatment
  • Asthma care
  • Child development and growth
  • Chronic condition management
  • Developmental problems
  • Disease prevention
  • Flu shots
  • Hearing screens
  • Injury treatment
  • Obesity and weight management
  • Vision screens
  • Patient and parent education
  • School and sports physicals
  • School problems
  • Vaccines and immunizations
  • Upper respiratory infection treatment
  • Well checks​​

Reviews

Average rating:

4.9
Questions were addressed
5
5 (106)
Provider explained things clearly
4.9
4.9 (106)
Likelihood of recommending this provider
4.9
4.9 (106)
Trust/confidence in physicians
4.9
4.9 (106)

What our families say

  • November 01, 2025

    Dr. Brennan is always a pleasure.

  • October 25, 2025

    Mary Brennan was exceptional. Her nurse that got us ready for the visit was awesome as well. All of the people we interacted with were so kind. I don't remember the nurses name that got us ready for our appt.

  • October 24, 2025

    We love Dr. Brennan, the assistants, and the office staff! Everyone is Top Notch!

  • October 08, 2025

    Dr Brennan is the best! She is the only pediatrician my kids have seen and my kids range from 32 to 14. She is very passionate and extremely thorough.

  • October 08, 2025

    I have never had a bad experience with Dr Brennan. I trust Dr Brennan with my children and the care she provides. She goes above and beyond. Answers any questions, even when I ask through the portal. She answers very promptly. Again she is the best!

  • September 23, 2025

    Dr Brennan is excellent!

  • September 23, 2025

    Always a great experience

  • September 19, 2025

    Dr. Brennan has been our family pediatrician for nearly 23 years. She puts children/teens at ease, communicates clearly to both the patient and the parent, and inspires confidence by her thoroughness and display of medical knowledge.

  • September 08, 2025

    Dr. Brennan heard my concerns and was very patient and explained everything I had questions about. She is one of the best Pediatricians out there.

  • August 29, 2025

    We saw Dr. Brennan for the first time and she was excellent.

  • August 29, 2025

    Dr. Brennan has such a calming demeanor and really made my daughter feel at ease

  • August 22, 2025

    The visit was efficient, well-organized, and overall a very positive experience. I appreciate the professionalism of the staff and especially the provider.

  • August 22, 2025

    All of the staff at the clinic were wonderful, from the young lady at check-in, to the medical assistant, and of course Dr. Brennan. Everyone was professional, kind, and made the visit a positive experience.

  • August 20, 2025

    Dr Brennan is the best pediatrician.

  • August 13, 2025

    Dr. Brennan is very helpful. Good listener and gives thorough explanations.

  • August 13, 2025

    Thorough well visit. Addressed all concerns, helped diagnose a concern and ran labs.

  • August 09, 2025

    Dr Brennan has always been an excellent pediatrician to our girls but we value her care even more as the years have gone by. Dr B - Thank you for your compassion and care for all your patients.

  • August 07, 2025

    We love Dr Brennan

  • July 29, 2025

    Dr. Brennan always takes the time to make sure that all the parents are well educated, but the child, regardless of the age

  • July 17, 2025

    Everyone is nice and very friendly

  • July 17, 2025

    Excellent staff and dr brennan is great doctor.

  • July 02, 2025

    Dr Brennan is always wonderful with both my children.

  • July 02, 2025

    Dr. Brennan is always caring and compassionate.

  • June 20, 2025

    We love the staff at the clinic and Dr. Brennan, she is the best!

  • June 19, 2025

    [...] is extremely sweet and just amazing energy! Dr Brennan was great! Very informative and listened really well and answered all my questions I had asked. She was very detailed in her knowledge and I really appreciate her putting in a lot of effort and showing she cared for my daughter and my concerns. Really amazing doctor!

  • June 15, 2025

    Dr Brennan and her staff are absolutely AMAZING

  • June 13, 2025

    Dr Brennan is always amazing.

  • June 12, 2025

    Dr. Brennan is amazing!!!

  • May 31, 2025

    Dr. Brennan is a phenomenal physician. The care with which she conducts her exams and attentively listens to her patients is second to none. Dr. Brennan has cared for our children since their birth, and we couldn't imagine better care!

  • May 13, 2025

    A Job well Done!

  • May 13, 2025

    The entire office was Amazing!

  • May 03, 2025

    We live Dr. Brennan

  • May 03, 2025

    We always have a great experience seeing Dr Brennan

  • May 03, 2025

    Dr Mary Brennan is truly and angel and the most amazing Dr . She always eases my anxiety and concerns when my daughter is sick

  • April 23, 2025

    Excellent team of care peoviders!!

  • April 23, 2025

    Dr Brennan is an excellent physician. She is not rished and gives us the time and ensures all our concerns are addresses.

  • April 19, 2025

    Dr. Brennan is extremely thorough. Always.

  • April 10, 2025

    I could not speak more highly of Dr. Brennan. She is thorough, kind, cares, trustworthy, and knowledgeable.

  • April 10, 2025

    Great visit! I always feel Dr. Brennan, the medical assistants, and office staff care about my child and want the best for her!

  • April 09, 2025

    Clinic is always kind and professional

  • April 09, 2025

    Dr. Brennan is AMAZING. She is so kind and always knows what to say to calm me as a first time mom. She is patient with my difficult toddler and I love her involvement with the community. She always makes time for [...] and my worries and I can't thank her enough for the care and security she provides to my family.

  • April 04, 2025

    Dr. Brennan is amazing and the best pediatrician

  • March 27, 2025

    All the staff were great. We had 3 tests to be done and they each walked us to the next location we needed to go.

  • March 21, 2025

    Always the best experience

  • March 21, 2025

    The nurse who worked with us was excellent!!

  • March 01, 2025

    Excellent experience!!!

  • March 01, 2025

    Dr Brennan is amazing. She is very good about seeing us when needed and very responsive on portal! She even called me after hours with recommendations after and XR was done. She is great with my girls and really all I could hope for in a Pediatrician!!

  • February 27, 2025

    Mrs. Brennan she is excellent!!!!

  • February 25, 2025

    Dr. Brennan had been my both of my boys' doctor since birth and we just love her.

  • February 25, 2025

    We always have a great experience. Dr. Brennan and her staff are always warm and supportive of our concerns and care.

  • February 14, 2025

    Dr. Brennan, for always providing great, quality care.

  • February 14, 2025

    From check in to check out, the entire staff was great. I appreciate you all.

  • February 05, 2025

    I love Dr. Brennan and feel so lucky to have her as a doctor. The nurse and office admins are very nice and helpful too.

  • February 02, 2025

    We love Dr Brennan and her staff

  • February 02, 2025

    Dr Brennan and her staff, they are always so nice and welcoming

  • January 31, 2025

    The staff was very helpful and attentive. They were also speedy in getting us seen.

  • January 26, 2025

    Dr. Brennan is always phenomenal with our children and takes time to make sure we understand the illness and treatment options.

  • January 18, 2025

    I will definitely recommend this doctor to any of my friends

  • January 18, 2025

    Dr Brennan is always amazing at taking care of us. Lots of important information

  • January 14, 2025

    The whole staff was great

  • January 14, 2025

    Dr Brennan was kind and very considerate

  • January 10, 2025

    All of the staff from beginning to end are the best. Dr. Brennan always provides the best care for our family.

  • January 08, 2025

    Dr. Brennan and the entire staff demonstrate an exceptional level of professionalism and dedication.

  • January 08, 2025

    The staff consistently demonstrates attentiveness and flexibility. I hold them in high regard and trust them with her care.

  • January 05, 2025

    Dr Brennan is always great

  • January 05, 2025

    No bad, all good! Wonderful office staff & doctor

  • December 21, 2024

    It was a good experience

  • December 21, 2024

    Dr Brennan has always been very good to both my children

  • December 17, 2024

    Great experience

  • December 17, 2024

    Dr Brennan is so responsive and does an amazing job of explanations and evaluation

  • December 08, 2024

    Dr. Brennan is the BEST pediatrician ever! We love her because she shows interest in everything about [...] wellbeing.

Education

  • Medical school:
  • Louisiana School of Medicine,New Orleans
  • Residency:
  • Baylor College of Medicine at Texas Children’s Hospital, Houston
  • Board certifications:
  • American Board of Pediatrics

Affiliations

  • American Academy of Pediatrics, American Board of Pediatrics,Cook Children's Physician Network

Recognitions

  • Mom Approved Doc 2019

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