GI Alliance Mansfield

Moustafa Youssef, MD | Gregory Brennan, MD | S. Odunsi-Shiyanbade, MD


By Drew Anderson | Photo by Lauren Medean

Experiencing stomach, intestinal or digestive issues can be debilitating and can often wreak havoc on your everyday life. Those internal issues can be scary, painful and frustrating. Finding the right gastroenterologist can make the difference between continued pain and the relief you desperately want. At GI Alliance Mansfield, three skilled doctors have combined their specialized experience in one brand new, state of the art facility. Their facility, located conveniently in Mansfield, caters to your comfort as a patient while also staying at the forefront of medical advances. The office offers a surgery center, infusion center and research center, all equipped with the most cutting-edge technology and equipment available today. 

Dr. Moustafa Youssef

Dr. Youssef is a highly skilled, board-certified physician in both gastroenterology and internal medicine. Dr. Youssef, who has been in practice over 10 years, specializes in GERD (gastroesophageal reflux disease), constipation, IBS (irritable bowel syndrome), and the management of inflammatory bowel disease including Crohn’s disease and ulcerative colitis. He also specializes in colon cancer screenings in an effort to fast-track early detection. Dr. Youssef believes in personalized medicine and endorses natural, easily obtainable products that can help improve many common GI issues. Dr. Youssef was among the first doctors in DFW to offer the Transoral incisionless fundoplication (TIF) procedure for treatment of acid reflux. In his free time, Dr. Youssef enjoys being outdoors, fishing, cooking and traveling. He is married and has two children.  

Dr. Suwebatu Odunsi-Shiyanbade

Dr. Odunsi-Shiyanbade is a board-certified gastroenterologist practicing in the Arlington/Mansfield area for over 12 years. She is well skilled to diagnose, treat and manage all forms of digestive diseases. She has a broad clinical background and particular interest in colon cancer screening and prevention, inflammatory bowel diseases and women’s health. She prides herself in listening to the patient and providing individualized care. She is a graduate of the University of Texas at Austin and has trained at acclaimed institutions including UT Southwestern and Mayo Clinic. Dr Odunsi-Shiyanbade and her husband live in Arlington with their two daughters. She enjoys reading and visiting local parks and museums with her family.

Dr. Gregory Brennan

Dr. Brennan is originally from Massachusetts and received his medical degree from Tufts University School of Medicine in Boston. He completed his internal medicine residency at UT Southwestern and gastroenterology fellowship at the University of California Irvine. He is board certified in internal medicine and gastroenterology. Additionally, he serves as an assistant professor at the University of North Texas Health Science Center. Dr. Brennan treats a wide range of digestive diseases involving the esophagus, liver, pancreas, intestines and colon. Outside of the office, Dr. Brennan enjoys spending time with his family including his wife, two young children and dog. 

It is important to know who you can turn to when dealing with unexpected, internal health issues. No matter what gastrointestinal problems you’re experiencing, the doctors at GI Alliance Mansfield are confident their knowledge and expertise can fast track you on the road to recovery.


647 North Miller Road
Mansfield, Texas 76063
(817) 415-9680

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