Executive Leadership Team

Johnson, BetsyElizabeth Johnson, MD

President and Chief Executive Officer

With over 17 years of experience in healthcare leadership and 20 years of clinical practice experience in internal medicine, Dr. Betsy Johnson brings to the MaineHealth ACO her passion for building and supporting a community model of health care that is value-based, integrated, and patient-centered.

Previous leadership roles have included chief medical officer at Martin’s Point Health Care and chief of internal medicine and adult urgent care at the Kenmore Center, part of Harvard Vanguard Medical Associates in Boston.

Dr. Johnson holds a Master of Health Care Management degree from Harvard School of Public Health, an MD from Vanderbilt University School of Medicine, and an AB from Bowdoin College. She serves as a board member of Maine Quality Counts and Coverys and chairs the board of Onpoint Health Data.


Moore, JenJennifer Moore, MBA

Chief Operating Officer

Jen Moore has over 20 years of healthcare leadership and operations experience and is dedicated to building effective teams with a strong focus on strategy and organizational development.

Ms. Moore joined the MMC-Physician Hospital Organization (the precursor to the MaineHealth ACO) in 1999. She leads ACO operations including payer contracting, network management, data operations and analysis, performance improvement programs, and practice support activities. She also oversees all activities associated with the Medicare Shared Savings Program and several commercial ACO contracts.

Ms. Moore holds a Masters of Business Administration degree and serves on the Board of Directors for the National Association of ACOs (NAACOS.)


Rob ChamberlinRob Chamberlin, MD, MBA

Chief Medical Officer

Rob Chamberlin is a practicing primary care internist. His leadership in health care has focused on performance improvement and primary care transformation. Prior to joining the MaineHealth ACO, he led Maine Medical Partner’s primary care group which serves 80,000 patients in the greater Portland region. Dr. Chamberlin received his medical degree from Boston University and completed his residency at Brigham and Women’s Hospital. Before entering medical school, Dr. Chamberlin served as a Peace Corps volunteer in Haiti, worked in the finance department at a Fortune 500 company and conducted operations management at an international healthcare non-profit organization.

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