Adult Gastroenterology Associates (AGA) is a single-specialty gastroenterology and hepatology (liver disease) practice that comprises ten physicians with three office locations in Tulsa and multiple satellite locations servicing much of Northeastern Oklahoma. For 30 years, AGA’s board-certified providers have been at the forefront of all aspects of their specialties, including colon cancer screenings, treatment of GERD, inflammatory bowel disease, irritable bowel syndrome, and treatment of diseases of the liver and pancreas.

AGA was founded in 1987 by Nicholas Mamalis, M.D. His vision was to change GI care in Tulsa for the better. Adult Gastroenterology Associates specializes in endoscopic innovation in Tulsa, having built the first freestanding endoscopy center that is convenient, but most of all, provides high-quality care to all patients.