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Our Providers

Dr. Shabbir Jamali, MD

Board-certified Gastroenterologists

For more than ten years, Dr. Shabbir Jamali and his family have been a part of the Houston community and have made Northwest Houston home. His dedication to his patients is reflected in the pride he takes in his gastroenterology medical practice at the Gastroenterology Diagnostic Center of Tomball where he has practiced for over two decades.

Dr. Jamali completed his Internal Medicine Residency at Wayne State Medical Center in Detroit Michigan in 1987. During his time in residency, he was awarded the honor of ‘Best Intern of the Year’ for his outstanding performance in his work and studies. He then completed a Gastroenterology Fellowship at the University of Connecticut Health Center at Farmington, Connecticut, and was later board certified in both internal medicine and gastroenterology by the American Board of Internal Medicine (ABIM.)

Over the years, Dr. Jamali has been an active member of many national and regional professional societies and associations including: American College of Gastroenterology (ACG), American Society of Gastrointestinal Endoscopy, (ASGE), Texas Society of Gastrointestinal Endoscopy (TSGE), Texas Gulf Coast Gastrointestinal Society, Texas Medical Association (TMA), and the Harris County Medical Society (HCMS). Involvement at all levels of the medical community allows Dr. Jamali to stay abreast of the latest research and technical developments in the field.

Dr. Shabbir Jamali

Dr. Avais M. Chatha, MD

Board Certified in Gastroenterology

Dr. Avais Chatha is a board-certified gastroenterologist in the Northwest Houston area at Gastroenterology Diagnostic Center, Tomball. His expertise includes all aspects of Gastrointestinal disorders, including Liver disease, Pancreatic and Biliary disorders, Colon Cancer screening, Ulcerative Colitis, Crohn’s Disease, GERD, IBS, GI Motility disorders, Hemorrhoid management, Constipation, Fecal incontinence and GI Tumors. He is dedicated to providing compassionate and comprehensive medical care to his patients, by taking the time to address all their concerns and explaining their disease and treatment plans in order to build a trusting patient-physician relationship.

Dr. Chatha completed a post-doctoral research fellowship in pancreatic cancer at Massachusetts General Hospital / Harvard University, Boston and his internship in General Surgery at New York Hospital Queens / Weill Cornell Medical College. He later received his board certification after his Internal Medicine residency at NYU Winthrop University Hospital, New York. Dr. Chatha then moved south for GI fellowship at the University of Mississippi Medical Center in the Department of Gastroenterology and Hepatology where he also served as Chief Gastroenterology Fellow and received advanced training in Upper Endoscopy, Colonoscopy, ERCP, and Fecal Microbiota Transplant.

Dr. Chatha is a member of the Texas Medical Association (TMA), Harris County Medical Society (HCMS), American Society for Gastrointestinal Endoscopy (ASGE), American College of Gastroenterology (ACG), and the American Gastroenterological Association (AGA). Dr Chatha has held office positions with Harris county medical society and is currently serving as President for Harris County Medical Society Northwest Branch.

Dr. Chatha enjoys spending time with his family, playing basketball and the electric guitar with his son, grilling and cheering on the Rockets and Astros.

Avais Chatha

Dr. Ali Hashmi, MD

Board Certified in Gastroenterology

Dr. Ali Hashmi completed medical school from Aga Khan University. He completed his Internal Medicine Residency and Gastroenterology Fellowship from Baylor College of Medicine. After finishing fellowship, he joined the faculty of University of Texas Medical Branch (UTMB) in Galveston as an Assistant Professor. After practicing at UTMB for two years, Dr. Hashmi moved to Boston, Massachusetts, where he worked at the Mass General and Brigham community physician organization for four years. In 2021, Dr. Hashmi moved back to Houston, Texas, to join the Gastroenterology Diagnostic Center.

During his faculty tenure at UTMB, Dr. Hashmi actively participated in clinical research and authored numerous manuscripts. He was also a pioneer of the GI Surgical Conference, a multi-disciplinary conference focused on complicated patients and procedures.

Dr. Hashmi is a Board Certified Gastroenterologist and is an active member of the following GI societies:

  • American Gastroenterological Association
  • American College of Gastroenterology
  • American Society of Gastrointestinal Endoscopy
  • Texas Society of Gastrointestinal Endoscopy
  • Texas Medical Association
In his free time, Dr. Hashmi likes to play squash and explore new biking trails with his two daughters.
Dr. Hashmi

Kristine L. Houselog, CNP

Ms. Houselog is a certified nurse practitioner at Gastroenterology Diagnostic Center. Her expertise includes everything regarding solid organ transplants and gastroenterology. She is motivated to ensure she provides sympathetic and high-quality care to all of her patients. She works hard to create trust-based relationships with all her patients by assessing the situation and then explaining the best ways her patients can be treated.

Ms. Houselog graduated from South Dakota University, receiving her master’s in arts and science in nursing. In addition, she received her board licensing as a nurse practitioner. She later worked as a nurse practitioner at Avera Gastroenterology in which she treated patients with issues related to the GI.

Ms. Houselog has moved to the Houston area to get closer to her family and children while also doing what she loves the most.

Kristine Houselog
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