Patient Reviews

GI Alliance physicians are among the most reputable and distinguished gastroenterologists across the nation. Focused on clinical excellence and patient-centered care, our specialists seek to be the partner you need in your quest for better health. We value patient feedback and appreciate every review we receive from those we are privileged to treat. For your convenience, we have gathered a collection of reviews, stories, and testimonials provided by patients who have visited our practices. We welcome you to explore the feedback below to learn more about what it means to be a patient of GI Alliance.

5.0 Review from D.&. Source: Google Mar 24 2023

"Dr Brennan was my attending physician for an Endoscopy. He was very professional, yet caring. He explained the procedure, was very patient and came to see me after the procedure. He took time to explain all that took place and and further instructed. I highly recommend Dr Brennan."

5.0 Review from L.M. Source: Google Mar 12 2023

"He is a good dr. I have only seen him once but his staff is so efficient and helpful."

5.0 Review from M.S. Source: Google Mar 11 2023

"I would like to compliment the staff at Dr. Brendan's office. They are the most caring and efficient staff at this medical center. They provide the best caring service. I was so impressed that I truly recommend Dr. Brennan and will continue to see him as my GI doctor because he's an excellent doctor. I was very pleased with his services."

5.0 Review from T.A. Source: Google Mar 01 2023

"He is a amazing doctor. I recommend him if you need gastroenterology."

5.0 Review from J.D. Source: Google Feb 28 2023

"I called to schedule an appointment and Brittany R. exceeded my expectations!! She was professional, kind and compassionate!! She really helped calm my nervousness."

5.0 Review from A.S. Source: Google Feb 18 2023

"He is very attentive to the patient’s concerns and ready to tackle the problem"

5.0 Review from A.F. Source: Google Jan 21 2023

"Dr. Brennan was informative and answered my questions and didn’t act like I was taking up too much of his time. The ladies in the office were all wonderful."

5.0 Review from C.W. Source: Google Jan 14 2023

"Everything went great he was very nice and explained everything that was going to happened that day. Great work to his team of nurses and the lady checking us in. Thank you!"

5.0 Review from S.P. Source: Google Jan 11 2023

"After being in pain and sick for a few weeks and taking medicine prescribed by my PCP who is an excellent doctor...I was referred to Dr Brennan...he was very helpful... advised me on what to do and scheduled test for me...he was very confident and I had no pain or anxiety just a couple of days after seeing test are upcoming and normally I would have a lot of anxiety and stress...and I have neither.. because of his confidence.and assurance. l highly recommend Dr Brennan and his entire staff was helpful ... friendly and reassuring. I am so thankful I was referred to him and his team."

5.0 Review from D.H. Source: Google Jan 05 2023

"Very polite,professional, explained everything well."

5.0 Review from R.B. Source: Google Jan 03 2023

"Excellent Dr. explains everything in terms I can understand."

5.0 Review from P.O. Source: Google Dec 31 2022


5.0 Review from O.E. Source: Google Dec 29 2022

"Dr Brennan and the staff were very professional and caring!"

5.0 Review from L.T. Source: Google Dec 22 2022

"Dr. Brennan is very thorough and absolutely attentive to his patients. I am bringing my entire family to his practice and would recommend anyone who is looking for a doctor who makes you feel like family. Cannot recommend him enough!"

5.0 Review from G.C. Source: Google Dec 22 2022

"May 2021, I came close to going to see my LORD and SAVIOR, with a failing liver and losing blood from both ends. Dr. Brennen just happened to be on call that night. He found esofagel varacies. He banded the bleeding vessels and I haven’t lost any blood since. Although I was in a coma for 2 days, he literally saved my life."

5.0 Review from T.D. Source: Google Dec 16 2022

"Great Doctor! Very professional and your not going to remember Anything!!"

5.0 Review from E.T. Source: Google Dec 14 2022

"He took care of my Mom. I would recommend. Thk you Dr.Brennan"

5.0 Review from K.B. Source: Google Dec 09 2022

"Dr. Brennan saw me on a Tuesday for the first time. He listened to my concerns and asked me if I would feel better if he scheduled a colonoscopy. He went above and beyond to get me in on Thursday. Fortunately, everything looked good and I’m happy and have peace of mind. He listens and reacts! I’m glad to have a gastroenterologist as needed!"

5.0 Review from L.C. Source: Google Dec 09 2022

"I recommend my forever doctor. If I can say smooth, nice, kind, and do the job as instructed. Dr. Brennan definitely saved my Life and I truly pray God continue to bless him and his practice! Blessings #YourAwesomeDoc"

5.0 Review from W.S. Source: Google Dec 08 2022

"Very patient and understanding"

5.0 Review from K.C. Source: Google Dec 01 2022

"Dr. Brennan was great to listen to all of my issues and to respond in a caring and compassionate way."

5.0 Review from M.M. Source: Google Nov 29 2022

"Dr. Brennan is very professional and listens to his patients and takes immediate action when necessary."

5.0 Review from M.C. Source: Google Nov 23 2022

"We just talked about the upcoming procedure and he listens well."

5.0 Review from B.W. Source: Google Nov 22 2022

"No Problems. Made it seamless."

5.0 Review from A.N. Source: Google Nov 08 2022

"Everyone made me feel comfortable and like I was their only patient."

5.0 Review from S.S. Source: Google Nov 08 2022

"Doctor Brennan and his entire crew are amazing! I was very apprehensive about my first colonoscopy, but Dr. Brennan and his entire team were extremely professional which made me feel very much at ease. The entire procedure was very quick and painless and they were extremely courteous. I would highly recommend Dr. Brennan and his entire staff."

5.0 Review from M.A. Source: Google Oct 27 2022

"Very good facilty and staff. So nice, patient, and clean. The doctor was good and explained everything in detail and afterwards."

5.0 Review from R.M. Source: Google Oct 25 2022

"Great bedside manner. Kind and personable. Listens to what you are saying to him. Cares for his patients with genuine concern."

4.0 Review from D.M. Source: Google Oct 20 2022

"Nice doctor and he was polite still waiting to hear from heart doctor he was going to set me up with other than that all good"

5.0 Review from R.S. Source: Google Oct 20 2022

"A doctor who listens while looking me in the eye."

5.0 Review from D.B. Source: Google Oct 20 2022

"I was dreading my colonoscopy, but Dr. Brennan and staff made me very comfortable, wait time was minimal and procedure time was on time. He and his staff are outstanding!"

5.0 Review from R.S. Source: Google Sep 21 2022

"I moved to Texas from the Midwest and it took me almost 2 years to find a good GI doctor. Dr. Brennan has listened to me and given me hope on my treatment."

5.0 Review from T.T. Source: Google Sep 20 2022

"This was my first colonoscopy and I was very pleased with the level of comfort I received from Dr Brennan and his staff."

5.0 Review from M.M. Source: Google Sep 19 2022

"The day of my procedure couldn’t have been better. The entire team Dr Brennan has is excellent, efficient, friendly, and great at what they do. I felt comfortable and well taken care of. I’d recommend him to any of my closest friends and family."

5.0 Review from S.D. Source: Google Sep 10 2022

"From the moment I walked in the drs office I was treated so well by all the staff. The entire staff was extremely nice, and professional and were happy to answer any of my questions, they even played my favorite music. Dr. Brennan is a wonderful man and doctor who was professional the entire time!"

5.0 Review from B.C. Source: Google Jul 26 2022

"Dr.Brennan was very thoughtful and knowledgeable as specialist and was MORE than willing to take the time to explain in great detail my mother's Plan of Care..."

4.0 Review from B.S. Source: Google Jul 26 2022

"Overall visit was good. Short wait time, friendly people and Dr. Brennan suggested a different medication and gave samples, that was very helpful."

5.0 Review from N.Y. Source: Google Jul 25 2022

"Dr. Brennan is a great doctor."

5.0 Review from C.H. Source: Google Jul 25 2022

"Dr. Brennan and his entire office were amazing. The OR team did such a good job as well. So glad I found this facility!!"

5.0 Review from J.D. Source: Google Jul 23 2022

"Thoughtful and attentive experience for my first colonoscopy. Everyone introduced themselves (front desk, nurses, nurse anesthetists, and doctor). They frequently checked for any needs I might have. If you’re not a regular patient at the practice, the doctor will meet you before and after the procedure. I have a medical background but I do not volunteer that info to my caregivers when I am the patient because I’m not at work, I AM THE PATIENT. With that said, be sure to ask questions or have someone with you who will ask questions after the procedure in case you’re thoughts are in the haze from the anesthesia. While the doctor will tell you what he did, removed polyps in my case for example, he did not face to face explain to me what polyps were and why they had to be removed. Maybe there were handouts that explained it but I admit I have not looked at the paperwork since leaving there. Even so, any handouts should reinforce what the doctor has already told you, in my opinion. Overall, I would definitely recommend this practice."

5.0 Review from J.G. Source: Google Jul 20 2022

"Dr Brennan listened to me and put me back on my medication. I really appreciated him listening to me. He heard my concern and properly addressed it. Thank you 😊"

5.0 Review from J.A. Source: Google Jul 20 2022

"My experience with Dr Greg Brennan at THR Mansfield ER, and at his office was highly impressive. He is compassionate, considerate and concise with his judgement. He has a positive aura that gave me confidence that God had me in hands that He can trust. 🙏"

5.0 Review from M.M. Source: Google Jul 20 2022

"I recently had a colonoscopy by Dr. Brennan. This office was very attentive to all my needs and Dr. Brennan was great, very nice and professional. I would highly recommend him."

5.0 Review from C.M. Source: Google Jul 14 2022

"He was very nice and easy to talk to"

4.0 Review from S.B. Source: Google Jul 12 2022

"I really just went to him 1 time and cannot honestly give an opinion on the first visit."

5.0 Review from F.I. Source: Google Jul 07 2022

"My first time seeing Dr Brennan. The office staffs are very professional and made me feel welcome. I was seen in a timely manner. Dr Brennan was very patient, I don’t feel hurried and he made me feel comfortable to discuss my medical issues."

5.0 Review from N.W. Source: Google Jun 16 2022

"A doctor with empathy, rare"

5.0 Review from R.&. Source: Google Jun 04 2022

"All of the staff were very professional and really friendly, positive, and good natured. The procedure went very smoothly with very little wait time."

5.0 Review from N.R. Source: Google May 11 2022

"I am a 67.yr old woman with a lot of gastroesophageal problems. Dr Brennan saw me for the first time the other day. I was thoroughly impressed with my experience with Dr. Brennan. He's already ordered an EGD, changed my medication. He is very through. He appeared to care about me the person. I think I'm going to enjoy this relationship. We can deal with the GERDS when we go in for the dilation. I look forward to having Dr Brennan as my doctor for rest of my life . His staff is also very courteous, kind, and professional. Thank you"

5.0 Review from S.H. Source: Google Apr 19 2022

"Dr. Gregory Brennan and his staff were all awesome when I went in for a colonoscopy. Everyone from the front desk to the pre-op nurses, the operating room team including anesthesiologist, the recovery room nurses, and of course, Dr. Brennan. All very professional yet very caring and all couldn’t do enough to make you comfortable and to make the experience as pleasant as possible. I highly recommend Dr. Brennan and his team at GI Alliance, Mansfield, TX."

5.0 Review from D.E. Source: Google Mar 24 2022

"I would definitely recommend my family to see him if they were experiencing any problems that he covers in his field. He is great!"

5.0 Review from P.V. Source: Google Mar 10 2022

"Everybody was very nice & I really impressed w/Dr Brennan. He was very informative , & made me feel at ease about the procedure. Thank you to that office."

5.0 Review from M.G. Source: Google Mar 08 2022

"Dr Brennan was very pleasant and professional in his mannerism. He was informative regarding my health needs. He provided knowledge of my medical history and executed a plan of care to my satisfacton. I would highly recommend Dr Brennan to someone requiring a GI physician."

5.0 Review from A.C. Source: Google Jan 10 2022

"Very professional and helpful"

5.0 Review from L.W. Source: Google Jul 17 2021

"Thorough and good bedside manner!"

4.0 Review from L.W. Source: Google Jul 14 2021

"This was my first visit. The staff were very professional. The Doctor had an interest in my situation. He listened, had questions and answers my questions. I am waiting to see what would be the next step to help me with my issues."

5.0 Review from C.O. Source: Google Jul 02 2021

"Our first time meeting the doc -very friendly, listens well and patiently."

5.0 Review from P.M. Source: Google May 02 2021

"I have gone to two other doctors and couldn't get in more than a year waiting to try to get in to see a GI doctor was I excited to be recommended to this doctor and he took me in within two weeks I was already in I couldn't believe that and I am so excited and not just that he gave me some proper medicine and I am not in pain I'm out of the bed and I'm up and going my husband's like oh my gosh what just happened and I am grateful that he took the time out to listen to me and gave me the right medication and is treating me well thank you so much him and his office his staff is so wonderful"

5.0 Review from M. Source: Google Apr 28 2021

"I have not seen this dr.yet But called the office to get help and an appointment. She was so nice and helpful. She was also very caring which is what I needed at that moment. Thank you!!!!!!"

5.0 Review from A.J. Source: Google Apr 13 2021

"I love this doctor, staff? I was supposed to get treatments a week sooner per doctors orders and here I am a week later waiting for the treatment!!! But I will express this to the doctor and hopefully this gets resolved. But the doctor is excellent and I will continue care with him!!!"

5.0 Review from J.P. Source: Google Apr 13 2021

"Good Dr. good staff. Talks to you on your level."

5.0 Review from P.J. Source: Google Apr 12 2021

"Great customer service. Dr Brennan is vert detail oriented"

5.0 Review from D.H. Source: Google Mar 29 2021

"Dr Brennan is the best gastroenterologist I've seen in Texas"

5.0 Review from T.H. Source: Google Mar 12 2021

"Front line staff was very friendly and professional. Wait time was appropriate. Doctor Brennan was great, he was patient and actively listened to my concerns."

5.0 Review from Z.S. Source: Google Mar 10 2021

"Dr. Brennan explain to me about the new pill products that has just been released,and gave me the option to be the first to try it . My procedure went well thanks to Dr. Brennan suggestion.Awesome work doc."

5.0 Review from K.H. Source: Google Mar 02 2021

"Based on Google reviews, I saw Dr. Brennan after suffering from kidney stones and possible colitis. His exam was professional and thorough, and the subsequent colonoscopy and EGD was relatively painless. The post-procedure visit included a thorough review of ongoing care. I am a cash pay patient and the office worked to ensure that they saved me money anywhere possible. Would highly recommend Dr. Brennan!"

5.0 Review from S.F. Source: Google Feb 27 2021

"Dr. Brennan truly partnered with me and my beliefs, offering functional medical treatments that had passed rigorous clinical trials. He answered my questions openly and clearly, was very thorough in his testing and diagnosis of my condition. His staff has always been supportive, professional and exceptionally helpful."

5.0 Review from R.T. Source: Google Feb 23 2021

"Dr. Brennan has an excellent bedside manner. He is very thorough and also very friendly. He takes the time to listen to my concerns and answer all of my many questions. I have never felt rushed. His office staff is also very friendly. Highly recommend!"

5.0 Review from E.F. Source: Google Dec 19 2020

"I was very pleased with Dr Brennan. He was my dr in a hosotial visit this past summer. Staff was real good too. I do however a bill from a credit organization regarding a bill. My medicare statements show payments already paid. I did speak to someone about this already. That's my only issue."

5.0 Review from D.H. Source: Google Dec 19 2020

"Dr. Brennan is awesome. He gets straight to the problem and solve it with no hesitation. I would refer him to anyone with stomach issues."

5.0 Review from L.R. Source: Google Dec 08 2020

"From making the appointment and then to see the doctor, went very smoothly. The staff was very nice and pleasant.. I rarely post about my appointments but thought it is rare to come across these days a doctor that listens and takes the time to talk about your issues without feeling rushed. Dr. Brennan’s bedside manner is very exceptional!!! I will definitely refer anyone to him!"

5.0 Review from H.W. Source: Google Dec 04 2020

"I was very pleased...and felted very comfortabe with both, the staff and Dr. Brenna. I am not computer savvy but the staff helped me navigate through the initial assessment, old school used to handwriting. As for Dr Brennan, the straight forward approach was welcoming with questions asked of me..I knew he was very knowelgeable and well trained as a first ever Colonoscopy..perfectly done without anesthesia, my choice ...and thankful my choice was honored. I have been blessed since our retirement from the Marine Corps to continue to receive or having medical staff provide services as military"

5.0 Review from S.S. Source: Google Dec 03 2020

"Dr Brennan is very personable and made me feel at ease. His staff is prompt and knowledgeable. I had an excellent experience!"

5.0 Review from J.H. Source: Google Nov 26 2020

"Dr. Brennan was caring and concerned. He listened to my symptoms and treated me immediately."

5.0 Review from T.L. Source: Google Sep 25 2020

"I truly appreciate and enjoy the services of Dr Brennan. I have been to several other physicians in an effort to at least get an idea of what was causing my unbelievably painful stomach pain and digestive issues, to no avail. To be honest I was being handled like a lab rat. Not one of them were able to give me any definitive answers or even feedback. After going to my initial consultation with Dr Brennan I felt like I was in good hands. He was very easy to talk to and he understood my dilemma. At the end of the visit he looked me in the eyes and reassured me that, “we are going to find out what is going on with you together”. I am very excited about being his patient and I look forward to working with him. I highly suggest or recommend him for anyone who has abdominal issues."

5.0 Review from J.I. Source: Google Sep 25 2020

"Very professional people,The Doctor interview is very helpful and very professional I very happy with the experience and results thanks Doctor Gregory Brennan and her team."

5.0 Review from M.I. Source: Google Sep 25 2020

"Dr brennan and staff are great. They are thorough, proactive, and are willing to educate the patient."

5.0 Review from J.D. Source: Google Sep 25 2020

"Great DR he helped me when my dr was out on leave a few weeks ago."

5.0 Review from T. Source: Google Mar 03 2020

"Dr Brennan is very patient and personable guy and answers all of your questions and does not make you feel like just another number, thank you sir to you and your staff"

5.0 Review from B.W. Source: Google Jan 27 2020

"Very professional, very good patient interface skills!"