Our Leadership
Susan Peach
Market President, HighPoint Health System
Chief Executive Officer, Sumner Regional Medical Center
Susan Peach, BSN, MBA, has been Market President of HighPoint Health System and CEO of Sumner Regional Medical Center since July. A veteran hospital administrator with more than 30 years of healthcare experience, Susan came to HighPoint Health System from LifePoint Hospitals' Hospital Support Center, where she served as chief nursing officer of the Delta Division since 2010.
Peach has been recognized for her efforts at SRMC by being awarded LifePoint Health’s prestigious CEO of the Year Award in 2013. She has also been named a “Most Admired CEO,” a “Power Leader,” and a “Woman of Influence” by the Nashville Business Journal.
Prior to joining LifePoint, Susan served as senior vice president, Performance Management, for Catholic Health Initiatives from 2003 to 2010; vice president, Strategic Quality Management and Clinical Services, and system chief nursing officer for Quorum Health Resources from 1996 to 2003; and chief executive officer (1995-1996) and chief operating officer (1992-1995) at Rockdale Regional Medical Center in Georgia.
Peach holds a Master of Business Administration degree from Georgia State University and a Bachelor of Science degree in nursing from Clayton College. She is also a certified Lean Six Sigma Black Belt, which means she is certified in leading complex improvement projects at an advanced level of proficiency. Peach and her husband Jim have been residents of Sumner County for more than 20 years.
John Doyle
Market Chief Financial Officer
John Doyle is Chief Financial Officer (CFO) for all HighPoint Health System facilities, including the flagship Sumner Regional Medical Center in Gallatin. John has accrued a wealth of healthcare finance leadership across multiple states including Texas, Kentucky and South Carolina.
In 1999, John was an original LifePoint Health employee as CFO at Logan Memorial Hospital in Russellville, Kentucky. He was impressed with the focus on quality of LifePoint Health, and is happy to continue his career building on the strong financial base at HighPoint, so that we may continue to expand essential health care services to the communities we serve.
Isabelle Garibaldi
Chief Nursing Officer
Isabelle Garibaldi, RN, DNP, is the Chief Nursing Officer for Sumner Regional Medical Center. Before her arrival at Sumner Regional, she served as CNO of Watertown Regional Medical Center, Watertown, WI., for six years.
Isabelle received her Certification in Executive Nursing Practice in 2014 from the American Organization of Nurse Executives (AONE), as well as her Nurse Executive, Advanced, Board Certified credentialing from the American Nurses Credentialing Center.
She holds an undergraduate nursing degree from the University of St. Francis, her Master of Science in Nursing from Lewis University, and her Doctorate of Nurse Practice from Rush University.
Geoff Lifferth
Chief Medical Officer
Geoff Lifferth, MD, was born in Madison, Tennessee, and has worked in the Emergency Department at Sumner Regional for the last 15 years. He did his undergraduate work at Brigham Young University, medical school at UT Memphis, and his Residency in Emergency Medicine at the Harvard Affiliated Emergency Medicine residency, working at Mass General, Brigham and Women’s Hospital and Boston Children’s Hospital.
Dr. Lifferth is board-certified in Emergency Medicine and has served in multiple leadership positions in our hospital, including previously serving as the Chair of the Ethics committee, and as the Chief of Staff for two years. He is the former vice president of the Tennessee AAEM, and currently serves on the board of directors.
He and his wife Kate have five children. He is an outdoorsman who enjoys backpacking, sailing, running and spending time with family and the Boy Scouts. He is also fluent in conversational Japanese.