Jill O’Brien, MD, FACP, joins Morton Hospital as Chief Medical Officer (CMO) and Medical Director of Hospital Medicine effective October 1, 2025. Dr. O’Brien succeeds Dr. Charles Thayer, who retires from his role as CMO but will continue to provide full-time surgical care to patients in his Morton Surgical practice in Taunton.
Dr. O’Brien has nearly two decades of experience in both clinical and leadership positions. Most recently, she served as Vice President of Strategy, Planning, and Optimization for Brown University Health. She has also served as Senior Medical Director of Utilization Management and as a practicing hospitalist at The Miriam Hospital, where she was elected President of the Medical Staff. Dr. O’Brien earned her medical degree from Georgetown University School of Medicine and completed her residency at Rhode Island Hospital.
“Dr. O’Brien is a transformative and effective physician executive whose career blends clinical excellence, strategic leadership, and operational innovation,” said Morton Hospital President and Vice President of Finance Heidi Taylor. “She models and believes in the same important values and culture our team members live by every day at Morton Hospital, and I’m confident she will be an incredible addition to our hospital and our patient community.”
In her new dual role, Dr. O’Brien will assume responsibility for all quality, safety, and clinical operations at Morton Hospital while also overseeing the hospital medicine program. She will provide clinical leadership to support the delivery of high-quality care and an exceptional patient care experience.
“I’m deeply inspired by the commitment and passion of the staff at Morton Hospital,” said Dr. O’Brien. “The Morton Hospital team is driven by purpose, compassion, and an unwavering dedication to patient care. It’s energizing to be surrounded by professionals who show up every day ready to make a difference for the communities we serve. Together, we’ll build on the incredible work already happening here and continue to elevate the care experience for every patient, every day.”
To learn more about Morton Hospital and its leadership team, visit mortonhospital.org.