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Ann Tucker, Chief Executive Officer


In 2012, Ann joined Greater Portland Health as Chief Financial Officer. In 2018, she was named CEO. She has more than 20 years of diverse leadership experience in drug retail, insurance and transit, with more than 13 years in the health care industry. She is honored to be part of a team that has expanded access and services to the greater Portland community as the health center continues to expand and thrive. Ann received her undergraduate degrees at the University of Southern Maine. She has an associate's degree in Business Administration and a Bachelor of Arts in Communication. Ann went to Saint Michael’s College to receive her Master of Science in Administration. She believes in the mission and is passionate about creating an exceptional patient experience and positive work culture for the team.

Renee Fay-LeBlanc, MD FACP, Chief Medical Officer


Dr. Renee has served as Chief Medical Officer at Greater Portland Health since June 2014. Dr. Renee graduated from the University of Vermont College of Medicine in 2003 and completed her residency in Internal Medicine at New York University in 2006. Prior to joining Greater Portland Health, she worked at Maine Medical Partners Cape Elizabeth Internal Medicine for 8 years. Dr. Renee is Board Certified in Internal Medicine, a Fellow in the American College of Physicians, and a McAfee Fellow through the Hanley Center for Health Leadership. Born and raised in Portland, Dr. Renee is honored to provide excellent healthcare to those most in need.

Bob Zager, Chief Financial Officer


Bob joined Greater Portland Health in June 2019. Bob is an experienced public and nonprofit finance and project management professional, having directed finance and human resources at a network of public high schools serving at-risk youth and managed the first randomized controlled trial of child development accounts. Bob earned an MBA from the Yale School of Management, a Master of Arts from the University of Illinois at Chicago, and a Bachelor of Science from Washington University in St. Louis. He is proud to live and work in the Greater Portland community and be a part of a team committed to quality and accessible patient care.

Cassandra Cote Grantham, Chief Operating Officer


Cassandra Cote Grantham joined Greater Portland Health as Chief Operating Officer in 2022. She brings 15 years of healthcare and nonprofit leadership experience in Maine to this role, specifically in the areas of pediatrics, clinic operations, community partnerships and quality improvement. She received her Master of Arts in Health Communication from Emerson College in collaboration with Tufts University Medical School after completing her Bachelor of Arts at Colby College. Cassandra additionally earned her Graduate Certificate in Medical Education Leadership from the University of New England, and completed a Hanley Center for Health Development Leadership Program. A lifelong Mainer, Cassandra is grateful for the opportunity to be a part of caring for the communities that Greater Portland Health serves. She lives in Falmouth with her husband, daughter and son, who keep her busy with youth sports and other activities. Together, they enjoy taking advantage of all the Maine outdoors has to offer.