About Our Team

Our doctors are Board Certified, University-trained, Gastroenterologists that are experts in treating disorders of the digestive tract, colon, esophagus, intestine, liver, pancreas, and biliary system. Our accomplished doctors have been honored and distinguished in many ways, including being recognized as Boston Magazine’s Top Doctors, serving as clinical instructors at Harvard Medical School and being members of academic societies.

Our Nurse Practitioners have extensive training and experience specifically within gastroenterology. They are important advocates for our patients and are valued colleagues. Our team is competent, caring, patient, and dedicated to making sure your visit is the best possible. 

Our practice was founded in 1983 by Doree T. Barton, MD, who died in the spring of 2015. He was a true pioneer in the clinical management of Crohn's disease and Ulcerative Colitis. Dr. Barton was uniquely dedicated to her patients and provided the highest quality care to thousands, and she leaves the legacy of an outstanding gastroenterology practice. For this, we are forever grateful.

Gastro Health Partnership

We are thrilled to share we are now in partnership with Gastro Health! For almost 40 years, our dedicated team of professionals has provided exceptional healthcare throughout the Greater Lowell and Southern New Hampshire area. Gastro Health shares our patient-centered mission and our ongoing commitment to providing the very best, personalized healthcare to this wonderful community.

It’s a big change - and no change at all. We are still your local GI providers, now partnering with national GI leadership and unprecedented local collaboration. We are working with Middlesex Gastroenterology (Acton, MA) and Greater Boston Gastroenterology (Framingham, Marlboro, Waltham MA)  to build the platform for Gastro Health – Massachusetts. We are thrilled to work together to better serve the community as a united group.

There are several things we want to point out that will not change:

  • You will continue to work with the same trusted team of providers in our office as you have in the past
  • The services we have provided in the past will continue to be offered
  • We will continue to operate from our current office
  • Our contact information will remain the same

We now have the resources and guidance and collective experience of our national group of over 350 gastroenterologists, including an exceptionally talented and collaborative coalition of Massachusetts GI colleagues. We are working together to elevate every patient’s GI healthcare across Massachusetts.

If you have any questions please do not hesitate to contact our office - we’ll be happy to hear from you and answer any questions you may have.

Doctors ReichheldAkerkarTravassosHuangLevey, and Petersile

Top Doctor 2017Top Doctor 2018Top Doctor 2019


Dr. Reichheld

James H. Reichheld, MD
Dr. Reichheld majored in Biology at Williams College and began his study of Medicine at Cornell University Medical College in New York City. He completed his Internship and Residency at Beth Israel Hospital in Boston, and Fellowship in Gastroenterology at The University of Massachusetts Medical Center, where he developed expertise in the care of liver and pancreatic disorders, Crohn's Disease, and Ulcerative Colitis. He enjoys coaching his three children, trail running, and is learning to play acoustic guitar.

Dr. James H. Reichheld | Top Docs | Boston Magazine


Dr. Akerkar

Geetanjali A. Akerkar, MD
Dr. Akerkar majored in Genetics at Cornell University and subsequently earned her MD at Cornell University Medical College. She completed her Internship and Residency at Beth Israel Hospital and then finished her fellowship in Gastroenterology at the University of California San Francisco. She stayed on faculty at UCSF developing expertise in Virtual Colonoscopy, Inflammatory Bowel Disease, and Liver Disease including Liver Transplantation. Dr. Akerkar is a Clinical Instructor in Medicine at Beth Israel Hospital, Harvard Medical School. She has been named a Fellow of the American Gastroenterology Association. She enjoys spending time with her family and playing tennis.

Dr. Geetanjali A. Akerkar | Top Docs | Boston Magazine


Dr. Travassos

Win J. Travassos, MD
Dr. Travassos majored in Biology at Harvard College and subsequently attended Cornell University Medical College in New York City. He completed his Internal Medicine residency and Gastroenterology fellowship at Beth Israel-Deaconess Medical Center in Boston. His areas of interest include liver disease, Crohn's disease, and Ulcerative Colitis, as well as medical education. Dr. Travassos is a Clinical Instructor in Medicine at Beth Israel Hospital, Harvard Medical School. Outside of medicine, he enjoys running and spending time with family.


Dr. Huang

Michael J. Huang, MD
Dr. Huang grew up in Maryland, graduated from the University of Maryland, and received his Masters of Science from the Johns Hopkins Bloomberg School of Public Health. He has always loved Boston, and attended Tufts University School of Medicine, staying to finish his internal medicine residency at Boston University and Boston Medical Center. Dr. Huang completed his Gastroenterology Fellowship at the University of Miami and the Jackson Memorial Hospital, where he developed interests in viral and autoimmune hepatitis, disorders of the esophagus, intestinal motility, Crohn's and colitis, and colon cancer screening. Dr. Huang joined Digestive Health Specialists in 2015 and, happy to be back in New England, enjoys skiing and spending time with his wife and little girl.


Dr. Levey

John Levey, MD
Dr. Levey received his M.D. degree from the University of Texas and completed his gastroenterology fellowship training at University of Massachusetts Medical Center. He earned the rank of Professor of Medicine at the University of Massachusetts Medical School and is well-published in many areas of gastroenterology and hepatology. Dr. Levey's areas of interest include general endoscopy, biliary endoscopy, and treatment of Barrett's esophagus.


Matthew Petersile, MD

Matthew Petersile, MD
Dr. Petersile graduated from Boston University with a BA in biology. He obtained his MD from Boston University School of Medicine and went on to complete his Internship and Residency at Boston Medical Center. Dr. Petersile completed his Gastroenterology Fellowship training at University of Massachusetts Medical Center and was selected as the Chief Gastroenterology Fellow during his final year of training. Dr. Petersile developed interests in treating Crohn's Disease, Ulcerative Colitis, Liver disease such as Cirrhosis, and in Colon Cancer Screening. Outside of medicine he enjoys playing board games, spending time with his family and giving lots of attention to his golden retriever.



Lauri Welch, NP
Lauri Welch has over 10 years experience in primary care and over 15 years experience in GI. She has been practicing in the Greater Lowell community for over 25 years. Lauri received a bachelor's degree in Nursing from the University of Lowell, master's degree in Family and Community Health Nursing and PhD in Nursing and Health Promotion from the University of Massachusetts Lowell. She holds a Certificate of Advanced Education in Obesity Medicine from the Obesity Medicine Association. Lauri has an interest in general GI, wellness, weight management, disease prevention and is well known for her care of patients with liver problems and experience in treating patients with Hepatitis B and Hepatitis C.


Elizabeth Muscatiello, PA

Elizabeth Muscatiello, PA-C
Elizabeth Muscatiello, PA-C completed her undergraduate education at Rensselaer Polytechnic Institute in Troy, NY. She then continued her education at Massachusetts College of Pharmacy & Health Science in Boston, MA. She is a certified Physician Assistant. 


Elizabeth Muscatiello, PA

Christine A. Corallino, CNP
Christine completed her B.S. in Nutritional Biochemistry at Purdue University in 2011, working as a dietitian and living in Brooklyn, NY and San Francisco, CA, later discovering a passion for nursing, and returned to Boston where she received her bachelor's and master's degree in nursing from the Institute of Health Professions in Charlestown in 2017, specializing in adult and geriatric medicine.

As a nurse practitioner, she has worked at the state hospital in Jamaica Plain, where she worked with patients admitted on chronic mechanical ventilation, renal dialysis, brain and spinal cord injuries, and those with complex infectious diaseses such as tuberculosis, HIV/AIDs, and infections of the bone and joint. She also has worked on the gastroenterology service in inpatient GI, gaining experience in working with any acute and emergent issues involving the GI tract and associated organs in the hospital setting. She also was trained to place gastrostomy tubes surgically and knowledgable in their short and long term mangement, if needed. Her GI interestes include, disorders of the esophagus, gut motility, biliary and liver disease, and genetic issues involving the small bowel and large intestine.

Outside of work, she loves to spend time with her cat, traveling with her husband, spending summers in southern Maine, listening to music and going to live shows, any outdoor activity, learning new skills and discovering new hobbies. She also has run two marathons and excited to be competing in the Chicago Triathlon in summer 2022.