Our Leadership
Kirsten Riggs
Interim President & CEO and Chief Operating Officer
Kirsten is an accomplished healthcare executive with 25+ years of experience working in areas of patient care, hospital operations, and physician alignment. In partnership with the UNC Health Rex executive team, Kirsten provides leadership and change management for 716-bed tertiary acute care hospital system to promote a reputation for quality, innovation, and clinical excellence. In her role as Interim President & CEO, Kirsten also leads the Triangle East partnership which includes four hospitals and multiple offsite care locations throughout Wake and Johnston counties.
Prior to becoming COO, Kirsten held the position of Vice President Heart and Vascular, which comprised more than 125 physicians and providers in over 25 locations. Kirsten has worked at UNC Health Rex for 20+ years, where she began as a staff nurse in surgical services. She has held leadership roles in surgical and ambulatory services. She holds a Bachelor of Science in Nursing from East Carolina University and an MHA from Pfeiffer University.
Chad Anderson
Vice President, Clinical Operations (Anesthesia, Endoscopy, Perioperative Services/Surgery, Pharmacy, Cary & Wakefield Ambulatory Surgery Centers and Raleigh Ortho Surgery Center)
As Vice President of Clinical Operations, Chad’s responsibilities include surgical services, pharmacy oversight as well as operational leadership and board membership within the UNC Health Rex ambulatory surgery center joint ventures. He began working at UNC Health Rex in 2019 after 13 years at Piedmont Hospital in Atlanta, where he was initially focused in cardiovascular service line development, and then shifted into surgical leadership before moving to Raleigh.
Chad received a Bachelor’s degree in Business Administration from Oglethorpe University in Atlanta, and a Master’s of Healthcare Administration from the University of Kentucky. He is a member of the American College of Healthcare Executives and has various civic interests.
Chad enjoys documentaries, housework with the kids, sports as both a player and spectator, and outdoor activities. He and his wife Hannah reside in Raleigh with their 3 children.
Maire Corcoran Ragozzine
Vice President, Hospital Legal Affairs
Maire has been a member of the UNC Health Legal Department since January 2017. Her practice focuses on health care regulatory matters, health care transactions, physician operations and arrangements, pharmacy, and clinical research.
Prior to joining UNC Health, Maire was Chief Compliance Officer of a hospital and physician network, in-house counsel at a nine-hospital health system, and in private practice at a regional law firm.
Maire received her undergraduate degree from the University of Virginia and her Juris Doctor from the College of William & Mary. Maire also maintains certifications in healthcare compliance (CHC) and healthcare privacy compliance (CHPC).
Tim Hester
Vice President, Physician Services
Tim Hester is the administrative leader of UNC Health Rex Physicians—UNC Health Rex’s growing employed physician group of over 400 providers. Spread across four hospitals and multiple counties, UNC Health Rex Physicians provides both dedicated inpatient services (General and sub-specialty Hospitalist care, Critical Care, Neonatology, etc.), as well as clinic and hospital-based sub-specialty care (Oncology specialties, Surgery, Gastroenterology, Cardiology, OB/GYN, Pulmonology, etc.).
Tim has spent most of his career working with physician practices in a variety of settings and subspecialties. He worked with UNC Health in the foundational years of UNC Physicians Network, which has become a thriving Primary Care network across North Carolina. He has been with UNC Health Rex for over a decade, working with areas such as General Surgery, UNC Health Rex’s Wound Healing Centers, and the hospital’s affiliated Ambulatory Surgery Centers.
Tim received a Bachelor’s degree in Economics and International Studies, with Highest Honors, from UNC-Chapel Hill, a Master’s in Healthcare Administration at the UNC Gillings School of Public Health, and a Juris Doctor at N.C. Central University. He loves Latin American culture and speaks fluent Portuguese, after spending over 18 months as a missionary in Brazil. Tim also loves spending time with his wife and nine children.
Diana Massa
Vice President, Clinical Operations (Cardiovascular, Neurodiagnostics, Sleep lab, Radiology, Respiratory Physical Therapy)
Diana Massa serves as Vice President of Clinical Operations. Her responsibilities include Heart and Vascular services, Radiology, laboratory, respiratory and rehab therapies.
Diana started at UNC Health Rex in 2001 as a respiratory therapist in our sleep medicine program. Over the last 20 years, Diana has served in a number of leadership roles. She has a strong interest in disease prevention and early detection, and led expansion and growth of our outreach and screening programs. She helped lead the planning, construction and opening of the N.C. Heart and Vascular Hospital.
Diana earned a Bachelor of Science in Respiratory Therapy at York College of Pennsylvania, and a Master’s of Health Administration from Pfeiffer University. She is a Registered Respiratory Therapist and a past President for the NC Society for Respiratory Care. Diana is an active volunteer in the community and involved with several professional organizations.
Diana’s interests include the outdoors, animal welfare and native plant gardening.
Benjamin Mathew, MBA
Vice President and Chief Financial Officer, Triangle East
The Triangle East region includes hospitals and clinics in Raleigh, Holly Springs, Clayton and Smithfield and elsewhere operated by UNC Health Rex and UNC Health Johnston.
Ben began his career at UNC Health in 2012. He has served in various finance leadership roles at UNC Health Rex and most recently was System Vice President of corporate finance for UNC Health.
He moved to the Raleigh area in 2010 to attend the Jenkins Graduate School of Management at N.C. State, where he earned his MBA in corporate finance
Megan Lumley, MBA, MHA
Vice President, Support Services
Megan serves as Vice President of Support Services. She has oversight of the UNC Health Rex Urgent Cares, Food and Nutrition Services, Environmental and Facilities Services, Protective Services, Inpatient Hospital Transport and Volunteer Services.
Since joining UNC Health Rex in 2001, Megan has held multiple leadership roles, including Urgent Care Director, Ambulatory Services Business Manager and Radiology Operations Manager. She earned a Bachelor of Science in Business from the University of Notre Dame and received two Master’s Degrees in Health and Business Administration from the University of Florida.
Megan is an active member of the community, serving on the Board of Directors for the POE Center for Health Education and Hilltop Home (Past President).
Megan lives in Raleigh with her husband, Sean, daughters, Kiera and Riley and two adorable and spoiled Goldendoodles, Lucky and Waffles.
Susan Moore, M.D.
President, UNC Health Rex Physicians
Susan is a practicing physician with REX Hematology Oncology Associates and has been an active member of the UNC Health Rex medical staff since 2006. She served as the Medical Director for the UNC REX Cancer Center for several years and more recently also served as Chair of the UNC Health Rex Physician Oversight Committee.
She received both her Doctor of Medicine with Highest Honors and Master of Public Health from the University of North Carolina at Chapel Hill and completed a residency in Internal Medicine at the University of California at San Francisco and fellowship in Hematology and Oncology at Emory University.
Susan enjoys traveling, reading, running, and most importantly, spending time with family and friends.
Lorie Rhine, MSN, RN, NE-BC
Chief Nursing Officer and Vice President of Patient Care Services, UNC Health Rex and UNC Health Rex Holly Springs Hospital
Lorie joined the team in November 2022. She previously served as Vice President/CNO of Summa Health System Akron from 2014 to 2022. She has an extensive background in quality and performance improvement from when she served as the System Director of Quality and Performance Improvement at The Ohio State University. She has served on several boards to serve and support the community; one she is passionate about is Habitat for Humanity.
Lorie is a board-certified nurse executive. She is a strong operational and strategic leader who led her nursing team during the pandemic. She is an authentic transformational leader committed to mentoring and lifelong learning.
She earned her Bachelor of Science in nursing from Kent State University and a Master of Science in nursing at The Ohio State University.
Roy Tempke, MHA, NHA, PT
Chief Operating Officer, UNC Health Rex Holly Springs
Roy joined UNC Health Rex in 1993 as a physical therapist and has served in a number of leadership roles, including administrator for the two UNC Health Rex skilled nursing facilities and as director of care management. In his current role, Roy is responsible for rehabilitation services, the skilled nursing facilities, care management and discharge planning, respiratory therapy, palliative care, psychiatry, and care re-design.
Roy serves on the board of directors for NAMI Wake County and is a volunteer reader for Partners Read in conjunction with the WakeEd Partnership.
Roy earned his Bachelor of Science with a certificate in physical therapy from the University of Pittsburgh and his Masters in Healthcare Administration for the University of North Carolina at Chapel Hill.
Roy lives in Cary with his wife and two sons. When not watching hockey, Roy enjoys cooking, running and traveling.
Meera Udayakumar, MD, SFHM
Chief Medical Officer (CMO) and Vice President, Medical Affairs, UNC Health Rex and UNC Health Rex Holly Springs Hospital.
Since joining the UNC Health Rex Hospitalist team in 2008, Dr. Udayakumar has held multiple positions and appointments, most recently as Chair of Medicine for UNC Health Rex Physicians, Medical Director of Quality and Innovation for Triangle East, and Medical Director of UNC Health Advanced Care at Home.
Dr. Udayakumar brings a proven track record of positive outcomes in patient safety, quality and innovation, coupled with a passion for leading teams in developing and implementing ground-breaking approaches to deliver high-quality, patient-centered and integrated care. She will help ensure that UNC Health Rex continues to be a leader in the healthcare industry locally and nationally.
Dr. Udayakumar received her Bachelor of Arts in Neuroscience Systems from Johns Hopkins University. She received her Doctor of Medicine from the University of Pittsburgh School of Medicine and completed her residency in Categorical Internal Medicine at Duke University Medical Center.
