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.


Aalberg, JeffJeffrey Aalberg, MD, MS

Chief Medical Officer

Dr. Jeffrey Aalberg has been a healthcare leader and practicing physician for 20 years. His deep commitment to promoting patient engagement and experience brings a singular focus to his clinical leadership of the MaineHealth ACO.

Prior to assuming his current role in 2009, Dr. Aalberg was the medical director of a large urban practice and residency training program serving 16,000 patients and overseeing care delivered by 40 physicians. He also served as medical consultant for MaineHealth from 2000 to 2009, supporting programs focused on infectious disease, pharmacy and supply chain management.

Dr. Aalberg holds an MD degree from the University of Massachusetts, an MS degree from University of Oregon and a BS from Rensselaer Polytechnic Institute. He has completed advanced studies in physician leadership, Integrative Medicine and advanced procedure training. Board certified in family medicine, he serve as an associate clinical professor at Tufts Medical School. He has served on numerous boards, and most recently joined the Southern Maine Agency on Aging Board of Directors. 


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.)