Our Providers
Bedford, Berlin, Londonderry, Raymond, and Windham.
Gastroenterologists
Deepshikha N. Chowdhury, MD
Dr. Chowdhury is a graduate of Mount Sinai School of Medicine, St. Joseph’s University Hospital, NJ, and New York Medical College at St. Joseph’s University Hospital, NJ. She has a special interest in colorectal cancer screening, gastrointestinal cancers, biliary disease and inflammatory bowel disease.
Laura C. Horton, MD
Dr. Horton is a graduate of Harvard College and Tufts University School of Medicine, where she was inducted into the Alpha Omega Alpha Honor Medical Society and received the Glasgow-Rubin Memorial Achievement Award from the American Medical Women’s Association as a woman graduating first in her medical school class.
Leon P. McLean, MD, PhD, MPH, AGAF
Dr. McLean is board certified in Gastroenterology and in Internal Medicine. He is a graduate of Tufts University School of Medicine, where he earned his M.D. and Master of Public Health degrees, and of the University of Maryland, Baltimore, where he earned a Ph.D. in Molecular Medicine. He completed both his Internal Medicine residency and Gastroenterology fellowship at the University of Maryland School of Medicine and the Baltimore VA Medical Center.
Steven Tsistrakis, MD
Dr. Tsistrakis received his medical degree from Sidney Kimmel Medical College at Thomas Jefferson University in Philadelphia, PA. He finished his residency at the Icahn School of Medicine at Mount Sinai Beth Israel in New York City. He did his Gastroenterology Fellowship at New York Presbyterian.
Advanced Practice Providers
Allison Anastasoff, APRN
Allison Anastasoff completed her Bachelor of Science in Nursing at Saint Anselm College in 2007. She earned her Master of Science in Nursing at the University of NH in 2016.
Alyssa Dunn, PA-C
Alyssa graduated from Saint Joseph’s College of Maine with a degree in Biology in 2011. She earned her Master’s degree in Physician Assistant Studies in 2015 from Massachusetts College of Pharmacy and the Health Sciences.
Stephanie Lynch, PA-C
Stephanie graduated from the University of Delaware with honors in 2011 with a degree in Biological Sciences. She earned her Master’s degree in Physician Assistant Studies with honors in 2015 from the Massachusetts College of Pharmacy and Health Sciences.
Connie McClain, NP
Connie McClain is a family nurse practitioner with extensive experience in both hospital and clinical environments. She earned her Master of Science in Nursing at the University of Toledo. Connie has professional affiliations and memberships with the American College of Gastroenterology (ACG), the American Association of Nurse Practitioners (AANP), and the Crohn’s and Colitis Foundation.
Amanda Sellers, NP
Amanda Sellers is a board-certified family nurse practitioner through the American Nurses Credentialing Center (ANCC) who brings a wealth of GI-specific experience. She earned her Master of Science in Nursing at Chamberlain College of Nursing.
Kristin Skelly, NP
Kristin Skelly is a board-certified Adult-Gerontology Nurse Practitioner through AANP with a Master of Science in Nursing and a deep commitment to compassionate, evidence-based care. She earned her BSN from the University of Rhode Island in 2005 and her MSN from Maryville University in 2016.
Beverly Tipton, NP
Beverly Tipton is a board-certified family nurse practitioner through AANP with over two decades of healthcare experience and a background in critical care. She earned her Master of Science in Nursing at Shenandoah University. Beverly is a member of the American College of Gastroenterology (ACG) and the American Association of Nurse Practitioners (AANP).