Our Leaders

Meet the individuals who lead our organization and teams on our journey to care for western North Carolina.


Greg Lowe
President, North Carolina Division


Terence Van Arkel
Chief Financial Officer, North Carolina Division


Sonya Greck, MSN, RN
Senior Vice President, Patient Safety Net Services and Behavioral Health

Sonya B. Greck has extensive experience in hospital leadership, development and operations. She has held various operational leadership positions in diverse rural and urban healthcare organizations. During her more than thirty-year career in healthcare, Sonya has led significant systems’ change efforts and fiscal operations. Her strategic and operational leadership in smaller hospitals and larger systems has resulted in development of facilities, programs and initiatives for improved quality, improved care and reduced costs.

She received her Bachelor of Science in Nursing from Clemson University, her Masters of Nursing Administration from University of South Carolina and is a member of Sigma Theta Tau. Sonya has a passion for her community and is on the Board of Buncombe County Health and Human Services. She serves on the Buncombe County Community Health Improvement Process (CHIP) Advisory Committee and on the Mission Health Community Benefits Committee.

Kathleen Culhane Guyette, MSN, RN, NEA-BC
Senior Vice President, Patient Care Services and President, Regional Member Hospitals

As chief clinical nursing leader, Guyette, is responsible for establishing consistent nursing practice standards across the health system. In addition to her responsibilities as the chief nurse executive for Mission Health, Guyette is leading the integration work for system clinical support services such as laboratory, rehabilitation services and pharmacy. She represents nursing staff within the health system and voices nursing perspectives within the community, governmental agencies and schools. Guyette brings more than 18 years of experience in nursing leadership. She served as the vice president and associate chief nursing officer for University of North Carolina Hospitals in Chapel Hill for seven years. In this role, she led the organization through multiple clinical information technology initiatives, developed advancement and leadership initiatives for nursing, reduced costs, and produced clinical and business improvements throughout the organization while maintaining excellent relationships with physicians, employees and colleagues throughout the system. Prior to joining the University of North Carolina Hospitals, Guyette served in multiple capacities in Rochester, NY at VIA Health, Rochester General Hospital and Strong Memorial Hospital. Guyette holds an MSN from University of Rochester and a BSN from The College at Brockport, State University of New York.

William R. Hathaway, MD, FACC
Senior Vice President and Chief Medical Officer, Mission Hospital

Dr. Hathaway currently serves as the Chief Medical Officer and Senior Vice President for Mission Health. He has been in this role since January 2013.

He completed his premedical education in Biology from Middlebury College in Middlebury, Vermont in 1984, graduating magna cum laude. Dr. Hathaway obtained his MD from the Medical College of Wisconsin, where he was a member of the Alpha Omega Alpha National Honor Society and class valedictorian of his 1988 graduating class.

Dr. Hathaway completed his Internship and Residency in Internal Medicine at Duke University in Durham, North Carolina where he also served as Chief Resident. Training in Cardiovascular disease followed at Duke, where his research interests focused on clinical trials in cardiovascular disease. He then returned to his native state of Wisconsin, where he practiced cardiology and served as Medical Director at the LaSalle Heart and Lung Center in Appleton, WI, before joining Asheville Cardiovascular Associates in 1999.

Leadership responsibilities have included service as Director of the Cardiac Catheterization Laboratory, Chief of the Cardiovascular Service Line, and Vice Chief and Chief of Staff from 2009 to 2012 before assuming his current role of Senior Vice President and Chief Medical Officer of Mission Hospital in 2013. He has held numerous leadership roles in multiple community organizations and currently serves on the boards of the Mountain Area Health Education Center, the Mission Health Partners Accountable Care Organization, the Highland-Cashiers Hospital and LifeShare of the Carolinas, as well as a participating member of the North Carolina Healthcare Association’s Physician Advisory Council.

David P. Franklin, MD, FACS
President, Mission Clinic

David P. Franklin, MD, serves as President, Mission Clinic for Mission Health. Dr. Franklin comes to Mission Health from Geisinger Health System in Danville, Pennsylvania, where he recently served as Chairman of Surgery. In his role with Mission Health, he leads both Mission Medical Associates (MMA) and practices contracted with Professional Service Agreements (PSAs).

Dr. Franklin earned his undergraduate degree from Emory University and is a graduate of the Bowman Gray School of Medicine at Wake Forest University. A Board-certified Vascular Surgeon, Dr. Franklin completed his surgery residency at Dartmouth, and his vascular fellowship at Massachusetts General Hospital. His current academic appointment is Clinical Professor of Surgery at Temple University. He has been published more than 75 times in peer reviewed medical journals. A Fellow of the American College of Surgeons (FACS) and a Distinguished Fellow of the Society for Vascular Surgery.

Dr. Franklin is an avid outdoorsman, including backpacking the Appalachian Trail throughout the eastern United States as well as canoeing. Dr. Franklin is the proud father of three adult children: Molly Deuson, an industrial engineer, who resides in Atlanta, Georgia with her husband, Alex. Hannah, who lives in Wilmington, North Carolina, works as the Regional Development Director for the Autism Society of North Carolina; and Lucas, a financial professional with Ernst and Young in Austin, Texas.

Rowena Buffett Timms
Senior Vice President, Government and Community Relations

Rowena Buffett Timms is Mission Health’s Senior Vice President for Government and Community Relations reporting directly to the CEO. In this role, she has responsibility for Mission Health’s legislative affairs, public policy strategies, national media and crisis management across this $1.9 billion integrated health system with 6 hospitals, numerous ambulatory sites, an employed Clinic of over 800 providers, one of the largest ACOs in the nation, and a $100M+ post-acute provider.

As an executive team member of this Top 15 Health System (by IBM Watson Health, six of seven years 2012-2018), Ms. Timms develops and implements impactful legislative strategies at the local, state and federal levels. Through strong and deep personal relationships with federal legislators, Ms. Timms facilitated Mission’s CEO testifying before the House Committee on Energy & Commerce (340B Drug Pricing Program) and before the Senate Committee on Finance (challenges with the Stark Law). Limited highlights from state-level achievements include: removing Mission Health’s Certificate of Public Advantage, an outdated, 20-year old regulation that raised costs and hampered Mission’s strategy to support necessary services, staff, equipment and technology; eliminating Certificate of Need review for any on-campus replacement hospital (saving Mission more than $1.25 million in consulting and legal fees and years of delay); and working with the General Assembly to pass a bill making it a felony to assault any hospital staff person on hospital property.

Ms. Timms also promotes Mission Health’s accomplishments and associated leadership nationally and regionally within the communities it serves. Through Ms. Timms efforts, Mission Health and its leadership have been featured in significant publications including: Modern Healthcare, the Wall Street Journal, US News and World Report and numerous other national healthcare publications. Ms. Timms also successfully partnered with the Asheville Citizen-Times to embed a reporter within Mission Hospital for two weeks – a unique program that resulted in more than 15 article and has since gained national attention. Ms. Timms oversees major events for Mission Health, including organizing a national Conference to ensure Humanity in Healthcare with nearly 180 participants from around the nation.

Prior to joining Mission Health in 2011, Ms. Timms gained more than a decade of healthcare senior leadership experience in government relations, community affairs and marketing including serving as the Vice President of Public Policy and Partnerships for CaroMont Health (Gastonia, NC) and as Senior Vice President of Government Affairs and Foundation for Bon Secours Health System (Greenville, SC). Ms. Timms previously served as Executive Vice President for Greenville Convention & Visitors Bureau, Director of Sales for the St. Louis Convention and Visitor Bureau, and Director of Sales for the Ritz Carlton Hotel Company.

Ms. Timms holds a bachelor’s degree from Florida International University and a master's degree in Strategic Public Relations & Policy from The George Washington University Graduate School of Political Management.

Don Esposito
Senior Vice President and General Counsel

Esposito is responsible for Mission Health’s legal affairs and serves as the primary legal advisor to Mission Health’s Board of Directors and senior leadership.

Esposito joined Mission Health in November 2017 from UNC Rex Healthcare in Raleigh, where he served as Vice President of Legal Services and General Counsel. In that role, he oversaw and directed the legal affairs of UNC Rex Hospital, a 660-bed acute care tertiary hospital in Raleigh, North Carolina and numerous facilities and physician practices throughout Wake County and the surrounding region. Esposito was engaged in numerous strategic and legal matters for UNC Health Care and also helped to conceive and develop Rex Health Ventures, a strategic venture capital fund designed to foster innovation. Prior to joining UNC Health Care, Esposito was in private practice in Charlotte and Raleigh and previously served as an Assistant Attorney General for the North Carolina Department of Justice. Esposito began his legal career in Asheville as a law clerk to United States District Judge Lacy H. Thornburg.

Esposito graduated from the University of North Carolina at Chapel Hill where he was a John Motley Morehead Scholar before receiving his JD from Harvard Law School. He is a member of the North Carolina State Bar and the North Carolina Bar Association. Esposito is admitted to practice before all North Carolina state and federal courts, the US Court of Appeals for the Fourth Circuit, and the US Supreme Court. In addition, he is a permanent member of the Fourth Circuit Judicial Conference.

Outside of work, Esposito enjoys reading (particularly United States history), traveling with his family, watching soccer, college basketball and his daughters’ various sporting events. He and his wife, Audrey, have three daughters: Addie, Mary and Emma.

Gwen McKinney
Chief Compliance Officer

McKinney’s leadership responsibilities include oversight of the Corporate Compliance Program for Mission Health, as well as the audit and compliance and privacy departments. McKinney also serves to facilitate the system-wide enterprise risk management process for the health system. She is native to Asheville and has been with Mission Health since 1983, serving in various roles during the progression of her career. McKinney started her career as a board certified medical laboratory technologist and has held positions in health information management and finance before joining audit and compliance services in 2000. McKinney graduated cum laude from Montreat College with a degree in Business Administration and received her MBA from Western Carolina University. She is certified in Healthcare Compliance through the Healthcare Compliance Association. McKinney serves on the board of Asheville Buncombe Community Christian Ministry and is the board treasurer. She and her husband, Greg, have two grown daughters. They enjoy traveling, hiking and spoiling their little dog, Sophie.

Marc B. Westle, DO, FACP
Senior Vice President, Innovation

Dr. Westle leads the innovative approach to health care delivery by leading a number of innovative health care delivery strategies, initiatives, and partnerships. Working in conjunction with the leadership team, Dr. Westle ensures Mission Heath leverages new technologies, products, and partnerships to deliver efficient, world-class health care in pursuit of Mission Health’s BIG(GER) Aim: to get each patient to the desired outcome, first without harm, also without waste and with an exceptional experience for the patient and family. Prior to his appointment as Senior Vice President of Innovation, Dr. Westle served as president and CEO of Mission Medical Associates (MMA), the physician group practice of Mission Health. A board-certified internist by training, Dr. Westle received his medical degree at the University of Health Sciences in Kansas City, MO, and went on to complete his residency at the University of Medicine & Dentistry of New Jersey’s Robert Wood Johnson Medical School. Dr. Westle’s professional affiliations include the American College of Physician Executives, Certified Physician Executive (CPE), Fellow of the American College of Physicians (FACP), and Fellow of Hospital Medicine (FHM) Society of Hospital Medicine. He has also completed the Program on Negotiation for Senior Executives at Harvard Law School. Dr. Westle and his wife, Jackie, reside in Asheville, with their two daughters, Amanda and Lacy.