Our Staff

Dr. S. Saeed Zamani

Dr. S. Saeed Zamani is certified by the American Board of Internal Medicine in Gastroenterology. He has extensive background in gastroenterology since 1987. He joined University of California San Diego (UCSD) as a visiting professor and dedicated his prolific time in research and publications in gastrointestinal disorders.

Dr. Zamani attended Internal medicine residency program at the University of Pennsylvania health System in Philadelphia and completed his fellowship in Gastroenterology and Hepatology at Thomas Jefferson University Medical Center in Philadelphia where he had extensive training in advanced endoscopy, gastrointestinal and liver disorders. He has extensive endoscopic experience in performing colonoscopy, upper endoscopy as well as ablative treatment for Barrett’s esophagus.

Dr. Zamani has been a member of Walnut Creek Medical Community for several years. He is a member of American Gastroenterological Association (AGA) and American Society for Gastrointestinal Endoscopy (ASGE). His passion and enthusiasm in clinical and academic gastroenterology further strengthen his commitment to high quality patient care. Dr. Zamani continues to offer the most current and advanced gastrointestinal services and highest standards of patient care.

His goal and passion is to provide Safe, Timely, Effective, Evidence-based and Patient-centered care to his patients. To achieve the above goals, he has designed quality care initiatives to accommodate patients.


Dr. Cynthia Mullen

Dr. Mullen received her medical degree from Tulane University in New Orleans. She completed her Internal Medicine training, including her Chief Residency year, at the University of Hawaii in Honolulu. She then went on to finish her fellowship training in Gastroenterology and Hepatology at the Upstate Medical University in Syracuse. She is board-certified in both Gastroenterology and Internal Medicine. She has extensive experience in the management of gastrointestinal and liver disorders.

In addition to her extensive endoscopic experience, including upper endoscopy and colonoscopy, she also offers in-office CRH O’Regan Hemorrhoid Banding.

Prior to relocating to California, she was active in the metropolitan Washington, DC medical community: as a practicing physician, medical society member, and community volunteer. On the national level, she is a member of the American College of Gastroenterology and has served on the Women in GI Committee for two years.

Her passion and enthusiasm for clinical and academic gastroenterology further strengthen our commitment to high-quality patient care. Dr. Mullen offers the most current and advanced gastrointestinal services. Since beginning practice in 2010, she has received numerous awards for patient satisfaction.