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Covenant Health is an innovative, Catholic regional delivery network and a leader in values based, not-for-profit health and elder care. We sponsor hospitals, nursing homes, assisted living residences and other health and elder care organizations throughout New England.

St. Mary’s Health System Welcomes Marc L. Demers, MD


Marc Demers, MDSt. Mary’s Health System, a member of Covenant Health, is pleased to welcome Marc L. Demers to its General Surgery team.

Dr. Demers received his medical degree from Boston University School of Medicine. He completed his residency at Maine Medical Center and completed his surgical oncology fellowship at the University of Texas M. D. Anderson Cancer Center in Houston. He is board certified in Surgery, a fellow of the American College of Surgeons, a member of the Society of Surgical Oncology, and a member of the American Society of Breast Surgeons. His clinical interests include breast cancer, multidisciplinary breast cancer management, benign breast disease, and familial breast cancer syndromes.

“We are thrilled to have Dr. Demers join our surgical team,” says Doug Smith, MD, Chief Medical Officer at St. Mary’s Health System. “Our breast health patients will benefit greatly from his experience with performing biopsies and breast cancer surgeries such as mastectomies and breast preservation procedures.”

St. Mary’s Health System is a proud partner of the MaineHealth Cancer Care Network. For more information, visit

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