• 978.465.4622

At the Newburyport Gastroenterology practice, the physicians strive to help patients achieve digestive health and well-being. Their expertise covers the evaluation, diagnosis and treatment of a wide range of gastrointestinal disorders, including colon cancer screening and colonoscopy, diseases of the small bowel, upper endoscopy, video capsule endoscopy, and liver disease.
Richard Zirin, M.D.

Richard Zirin, M.D.

Dr. Zirin is dually certified in internal medicine and gastroenterology, and has more than three decades experience helping diagnose and treat problems in the digestive system.

  • Medical School: Boston University School of Medicine
  • Internship: George Washington University Hospital
  • Residency: George Washington University Hospital
  • Fellowship: University of Connecticut
  • Board Certification: American Board of Internal Medicine, Gastroenterology
Mark Amorosino, M.D.

Mark Amorosino, M.D.

Dr. Amorosino is board certified in gastroenterology. He received his medical degree from Boston University and performed his post-graduate training at Boston Medical Center and the Boston Veteran’s Administration Medical Center. Dr. Amorosino is an active physician leader and currently serves on the hospital's Board of Trustees.

  • Medical School: Boston University School of Medicine
  • Residency: Boston Medical Center & Boston Veterans Administration
  • Fellowship: Boston Medical Center & Boston Veterans Administration Gastroenterology
  • Board Certification: American Board of Internal Medicine, Gastroenterology
Thomas C. Liu, M.D.

Thomas C. Liu, M.D.

Dr. Liu is board certified in internal medicine and gastroenterology. He received his medical degree from Northwestern University and performed his post graduate training at the University of Maryland and Boston Medical Center. After completing training, Dr. Liu joined the faculty at Weill Cornell Medical Center/New York Presbyterian Hospital. He then served as Chief of Gastroenterology at the New England Baptist Hospital in Boston with a joint teaching/practice position at Beth Israel Deaconess Medical Center.

  • Medical School: Northwestern University Feinberg School of Medicine
  • Residency: University of Maryland Medical System
  • Fellowship: Boston Medical Center & Boston Veterans Administration Gastroenterology
  • Board Certification: American Board of Internal Medicine, Gastroenterology