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Leadership

Executive Leadership

Mark Nantz, MHA

President and Chief Executive Officer, Valley Health

Photo of Mark NantzMark Nantz is president and chief executive officer of Valley Health System, a not-for-profit network of hospitals, services and providers based in Winchester, Virginia.

Prior to joining Valley Health, Nantz served in executive roles with Bon Secours Mercy Health, including most recently as chief administrative officer and Atlantic Group President; before then, he was executive vice president and chief strategy officer at Bon Secours. He has also held executive positions at Carolinas Healthcare System (now Atrium Health) and Carolinas Medical Center ‐ NorthEast, and leadership roles in the audit practice of a Big 5 accounting firm. He is a Certified Public Accountant and a fellow in the American College of Healthcare Executives.

Nantz is a visionary executive with a record of improving patient satisfaction, quality metrics, and physician and employee engagement. During his 30-plus year tenure in health care, his professional accomplishments include building advanced clinical programs and successful physician and community partnerships, and instituting organizational effectiveness and strategic business plans at the local, regional, and system levels.

Nantz earned a Master of Health Administration from Pfieffer University, and a Bachelor of Science in Accounting from the University of North Carolina ‐ Charlotte. An engaged community leader, he has volunteered in leadership roles with numerous non‐profit and civic organizations, including chambers of commerce, the American Heart Association, the March of Dimes, and organizations supporting the fine arts. He and his wife, Courtenay, reside in Winchester.

Barbara Ballard, MBA
Chief Information Officer, Valley Health

Barbara Ballard

Barbara Ballard joined Valley Health in 2022 and serves on the health system’s executive leadership team. She leads all technology, information system, and medical record functions in the organization, as well as the implementation of strategies supporting a technological transformation at Valley Health.

Prior to joining Valley Health, Ballard served as vice president and associate chief information officer at Carilion Clinic. She has served in senior management positions driving healthcare operations, strategic planning, information technology visioning and execution. Ballard earned her Bachelor of Arts from University of Central Florida and her master’s in Healthcare Administration from Indiana Wesleyan University.

Jeffrey Feit, MD, MS
Valley Health Population Health and Community Health Officer

Jeffrey Feit, MD

Jeffrey M. Feit, MD, MS, serves as Valley Health population health and community health officer. He collaborates with community partners to advance region-wide health and wellness efforts. Dr. Feit joined the administrative team in 2012, following six years as vice president of Medical Affairs at Page Memorial Hospital (PMH).

He previously practiced family medicine in Luray and Fairfax, Va., and has held appointments on the faculty of VCU and UVA departments of Family Medicine.

Dr. Feit earned his medical degree and completed a residency in family medicine at the UVA School of Medicine. He has a bachelor’s degree in International Affairs and Public Policy from Princeton University and a Master’s of Science in Health Care Administration from Virginia Commonwealth University.

Peter Gallagher, MBA
Chief Financial Officer, Valley Health

Peter Gallagher

Gallagher began his career with Coopers & Lybrand in Cincinnati, and has served in financial leadership at Health Corporation of Virginia, The Johns Hopkins Hospital in Baltimore, Scioto Valley Health Foundation in Portsmouth, Ohio, and Bon Secours Virginia. His experience includes work as president and CEO at a healthcare advisory firm.

Gallagher graduated from Miami University in Ohio with a bachelor’s degree in accountancy, and earned a Master of Business Administration from Xavier University in Cincinnati. He is licensed as a Certified Public Accountant in Virginia and is a Fellow of the Healthcare Financial Management Association.

Nicolas C. Restrepo, MD
Valley Health Quality and Patient Safety Officer

Nicolas C. Restrepo, MD

Nicolas C. Restrepo, MD, serves as the quality and patient safety officer of Valley Health.

A board-certified urologist, prior to assuming his current role as vice president of Medical Affairs, Dr. Restrepo had been in private practice with Urology Clinic of Winchester and a member of the Winchester Medical Center attending medical staff since 1995. He has served as chairman of Winchester Medical Center’s Division of Urology, chair of the Department of Surgery, and a member of the Medical Staff Executive Committee.

Dr. Restrepo earned his undergraduate degree from Catholic University of America and his medical degree from the University of Virginia. He completed his internship and residency at Pennsylvania State University College of Medicine.

Brad Rogers, MHA

Chief Operating Officer, Valley Health Medical Group, and Vice President, Valley Physician Enterprise

Brad Rogers

Brad Rogers, MHA, is chief operating officer of Valley Health Medical Group and vice president of Valley Physician Enterprise.

Prior to joining Valley Health, Rogers was vice president of operations at Lexington Medical Center in South Carolina. He was also the chief administrative officer of UCLA Health’s Department of Orthopaedic Surgery in Los Angeles, California. Rogers began his healthcare career at Palmetto GBA, a Blue Cross Blue Shield of South Carolina subsidiary, where he created training programs used by Medicare contractors throughout the U.S.

Rogers received his Bachelor of Arts from Emmanuel College and his Master of Health Administration from Saint Louis University.

Chris Rucker, MHA
Chief Strategy Officer and Chief of Staff, Valley Health

Chris Rucker

Chris Rucker serves as chief strategy officer and chief of staff for Valley Health. Rucker is responsible for leading the development and execution of Valley Health’s strategy, operational planning and business development. In addition, he leads brand and creative strategy, overseeing marketing and communications, physician relations, and public relations.

As President of Valley Regional Enterprises, an operating subsidiary of Valley Health, Rucker focuses on the organization’s retail, consumer focus, and ease of access initiatives and is the healthcare system’s executive responsible for Urgent Care and Employer Health services, outpatient pharmacy, medical transport service, home health, certain physician joint venture activities, and is the organization’s lead emissary to regions without a Valley Health Hospital presence.

Rucker has a bachelor’s degree in Business Administration and a Master’s in Health Administration.

Iyad Sabbagh, MD, MBA
Chief Physician Executive and President, Valley Physician Enterprise

Iyad Sabbagh, MD, MBA

Iyad Sabbagh, MD, MBA, is chief physician executive and president of Valley Physician Enterprise. Dr. Sabbagh has over 13 years of senior healthcare management experience within multi-hospital systems. Most recently, he served as vice president, chief quality officer, and associate chief medical officer for Northern Light Health, a nine-hospital, not-for-profit health system in Maine with over 10,000 employees, a 690-member employed physician group, and nine long-term care and residential facilities.

Dr. Sabbagh earned his medical degree from the University of Damascus, School of Medicine in Syria and completed a residency in Internal Medicine at Mercy Hospital and Medical Center, University of Illinois in Chicago. He earned a Master of Business Administration from the University of Massachusetts at Amherst and is a Certified Physician Executive (CPE). He is a diplomat of the American Board of Internal Medicine and a Fellow of the American College of Physicians.

Elizabeth Savage, MSOD
Chief Human Resources Officer, Valley Health

Elizabeth Savage

Elizabeth (Liz) Savage, chief human resources officer (CHRO), joined Valley Health in 2010, and serves on the health system’s executive leadership team.

She has more than 25 years of experience in human resources and organizational development at for-profit and not-for-profit organizations. Prior to joining Valley Health, Savage served the healthcare community as senior vice president, Human Resources, at Bon Secours Charity Health System in the Hudson Valley region of New York. Prior to that, she led workplace improvement efforts at GE Capital, Norbert Technologies, and Hyperion Software.

Savage received her Master of Science in organization development from American University/National Training Laboratory in Washington, D.C., and her undergraduate degree in business administration from the State University of New York at Albany.

Tonya Smith, MHA

Senior Vice President, Acute Care, President, Winchester Medical Center

Tonya Smith, PharmD, MHA, MBA, FACHE, joined Valley Health as senior vice president of acute care and president of Winchester Medical Center in September 2022. She serves on the Executive Leadership Team and has 25 years of experience in the healthcare industry. She first joined Valley Health in 2007 as Winchester Medical Center’s Pharmacy director, assuming systemwide responsibility for Pharmacy, and eventually transitioned to vice president of Operations and Ancillary Services, a position she held until 2015. After seven years with Munson Healthcare in Traverse City, Michigan, leading six community hospitals and Munson’s system integration efforts, Tonya returned to Winchester.

Smith earned a Doctorate in Pharmacy from the University of Maryland, followed by a Master of Health Administration and Master of Business Administration from University of Maryland University College.

Theresa L. Trivette, DNP

Chief Nursing Executive (CNE), Valley Health

Dr. Trivett

Theresa L. Trivette, DNP, RN, CENP, joined Valley Health as its Chief Nursing Executive (CNE) in October 2021. She serves on the Executive Leadership Team and is responsible for leadership of all nursing functions across Valley Health.

Dr. Trivette has over 20 years of experience as a nurse. Since 2009, she has served in senior healthcare management positions, including chief nursing officer at Ballad Health in Tennessee, and at Advent Health in Tampa, Florida; associate vice president/chief patient safety officer at Advent Health in Tampa; and director of quality assessment and performance improvement at Wake Forest Baptist Health in North Carolina.

Trivette earned a Doctor of Nursing Practice from the Medical University of South Carolina; a Master of Science in Nursing from Gardner-Webb University; a Bachelor of Science in Management Studies/Healthcare from University of Maryland University College; and an Associate of Science in Nursing from the College of Southern Maryland.

Senior Management

Bob Amos, MBA

Vice President Finance, Winchester Medical Center and Warren Memorial Hospital

Bob Amos

Robert M. “Bob” Amos is vice president of finance for Winchester Medical Center and Warren Memorial Hospital.

Amos joined Valley Health in 2005 and has 20 years of diverse healthcare experience. Previous employment includes Jefferson Memorial Hospital, The Hospital for Sick Children, The Daughters of Charity, Ascension Health Care, Fairmont General Hospital, and Genesis Health System.

Amos earned his bachelor’s degree in accounting from Fairmont State University, and his Master in Business Administration from West Virginia University. He became a West Virginia Certified Public Accountant in 1993.

Mark Baker
Vice President, Facilities Management and Safety, Valley Health

Mark Baker

Mark Baker is vice president, Facilities Management and Safety, for Valley Health. He is responsible for clinical engineering, construction services, engineering, safety and emergency management and security.

Baker joined Valley Health in 1994 as a facilities engineer and within four years was promoted to director. He has directed the design, construction and occupancy of more than $700 million in projects including replacement facilities for Hampshire Memorial Hospital, Page Memorial Hospital and War Memorial Hospital; the Winchester Medical Center north tower expansion; and the new emergency department and medical building at Shenandoah Memorial Hospital.

Baker earned his bachelor’s degree in industrial engineering technology from the University of Maryland.

N. Travis Clark, MOL
Vice President, Valley Health; President, Shenandoah Memorial Hospital and Page Memorial Hospital

N. Travis Clark

N. Travis Clark is a Valley Health vice president, and president of Page Memorial Hospital and Shenandoah Memorial Hospital.

Clark began his career at Page Memorial Hospital in 1997 as the Director of Rural Health Clinics. In 2000, he was promoted to chief financial officer, a position he held for five years before his promotion in 2005 to President of Page Memorial Hospital. In 2016, Travis was promoted to vice president of operations for Valley Health Southern Region, and president of Page Memorial Hospital and Shenandoah Memorial Hospital.

Clark has a bachelor’s degree in Business Administration and a Master’s in Organizational Leadership.

Jennifer Coello, MHA
Vice President, Operations and Administrator, Warren Memorial Hospital

Photo of Jennifer Coello

Jennifer Coello, MHA, is vice president, Operations and Administrator for Warren Memorial Hospital, and brings rich healthcare experience, including work at a national health quality association, a regional health planning agency, and in the management of hospitals in Virginia, Georgia, and Ohio. She most recently served as Administrator for East Ohio Regional Hospital, where during her tenure, the hospital grew its clinical service lines, achieved a significant decrease in its overall readmission rate, and attained the 2019 Patient Safety Excellence Award by Healthgrades.

As WMH Vice President Operations & Administrator, Coello is a key member of the Valley Health System Acute Care executive and senior leadership teams. She is a graduate of the University of Virginia with a BA in psychology and earned a Master of Health Administration from Virginia Commonwealth University. She is board certified in healthcare management by the American College of Healthcare Executives (ACHE).

Teresa Collins
Chief Nursing Officer, Winchester Medical Center

Teresa Collins joined the Valley Health team as Chief Nursing Officer at Winchester Medical Center (WMC) in 2022. Teresa has over 30 years of experience in the healthcare field with a clinical background in adult and pediatric critical care, emergency services, and hospital and post-acute care quality. She has extensive experience at the executive level, most recently as the vice president/chief nursing officer at Ascension Saint Thomas Rutherford Hospital in Murfreesboro, Tennessee. Teresa earned both her bachelor’s and master’s in Nursing, Healthcare Administration from Walden University. She also holds advanced certification as a nurse executive (NEA-BC) from the American Nurses Credentialing Center, and is in pursuit of her Doctorate of Nursing, Executive Nursing Leadership at Baylor University.

Carla Dallmann, BSN, MBA, MJ, CPHRM, CPCO
Vice President, Risk Management, Valley Health

Carla DallmanCarla Dallmann, BSN, MBA, MJ, CPHRM, CPCO, is the Valley Health vice president of Risk Management, using her rich background in nursing and risk management, patient safety, and health law. In addition to supporting system-wide performance improvement and patient safety initiatives, she facilitates the system-wide Patient and Family Advisory Council to ensure we benefit from patient and family perspectives in all of our initiatives.

Dallman received her Bachelors of Science in Nursing at University of Wisconsin and her Masters of Business Administration at Averett University. She also earned her Masters in Healthcare Law at Loyola School of Law and Certificate in Healthcare Corporate Compliance at George Washington University.

James Freilich, MD
Vice President of Medical Affairs, Warren Memorial Hospital

Carla Dallman

James W. Freilich, MD, is the vice president of medical affairs for Warren Memorial Hospital. He has been with Warren Memorial Hospital since 2002 and most recently served as the hospital’s Emergency Department medical director.

Dr. Freilich is a double graduate of the University of Virginia, having received his undergraduate degree from the McIntire School of Commerce and later graduating from the School of Medicine.

Kenneth Janowski, DO, CPE

Vice President of Medical Affairs at Winchester Medical Center

Kenneth Janowski

Kenneth Janowski is vice president of medical affairs at Winchester Medical Center. Dr. Janowski leads the organization’s continued development as a High Reliability Organization, monitors patient satisfaction and leads WMC imperatives in the areas of quality improvement, patient safety and risk management.

Dr. Janowski was most recently the chief medical officer of Bon Secours Charity Health System in New York. He has also served as New York Medical College program director, chief medical officer of Hackettstown Regional Medical Center (NJ), medical director of Karen Ann Quinlan Hospice (NJ) and medical director of The House of the Good Shepherd, a senior living facility in New Jersey.

Dr. Janowski graduated from the University of Medicine and Dentistry of New Jersey School of Osteopathic Medicine and completed his residency in internal medicine. He earned his Certified Physician Executive (CPE) credential in 2015.

David Kliewer, MD
Vice President, Medical Affairs, Hampshire Memorial Hospital and War Memorial Hospital

Zehner

David Kliewer, MD, is vice president of Medical Affairs for Valley Health’s two West Virginia hospitals – Hampshire Memorial Hospital in Romney and War Memorial Hospital in Berkeley Springs. In his role, Dr. Kliewer has primary oversight for patient safety, quality of care improvement, physician engagement, and documentation accuracy and improvement in the West Virginia hospitals.

Since 2002, Dr. Kliewer has practiced as an anesthesiologist with Winchester Anesthesiologists, Inc. During his time with Winchester Anesthesiology, he has held the role of WMC chairman of the Department of Anesthesia, medical director for the southern region hospitals and medical director of the Surgicenter of Winchester.

Dr. Kliewer graduated from the Johns Hopkins University School of Medicine and completed his residency at Massachusetts General Hospital.

Christine Lowman, CPA, CHFP
Vice President Finance and Corporate Controller, Valley Health

Photo of Christine Lowman

Christine Lowman is vice president of Finance and corporate controller for Valley Health. She joined Valley Health in 1998 in the internal audit department.

Prior to her current role, Christine was the vice president and CFO for the west region for seven years, which includes both Hampshire and War Memorial Hospitals.

Christine earned a Master of Business Administration and Bachelor of Science in Accounting from Frostburg State University. She is also a Certified Public Accountant and maintains active licensure in both Virginia and Maryland.

Jake Meza, MBA

Vice President, Operations, Ambulatory, Post-Acute and Community Services

Jake Meza

Jake Meza is vice president for Operations, Ambulatory, Post-Acute and Community Services. He is responsible for Valley Health’s Home Health agencies, Wellness and Fitness Centers, outpatient rehabilitation services, Valley Medical Transport, Urgent Care and Employer Health services, retail pharmacies, and Valley Health’s telemedicine program. Jake also leads operational activities for Valley Health service providers in the Eastern Panhandle of West Virginia.

Meza joined Valley Health in 2010 as director, Urgent Care Services, after working as executive director of GTM Medical Consulting, managing over 30 medical practices in Richmond, VA. He was promoted to senior director, Valley Regional Enterprises, where oversight of Valley Pharmacy and Valley Medical Transport were added to his responsibilities.

Meza received a BA from Christendom College in Front Royal and a Master in Business Administration from Benedictine University in Kansas.

Julie Miksit, RN, BSN, MBA

Vice President of Operations and Service Lines, Winchester Medical Center

Julie Miksit, RN, BSN, MBA

Julie Miksit, RN, BSN, MBA, is vice president of Operations and Service Lines at Winchester Medical Center (WMC). Miksit’s primary responsibilities include ensuring WMC’s service lines deliver a high level of patient care and working collaboratively with Valley Health entity leadership in Business Development and Strategic Services. Miksit also directs operations for Heart & Vascular, Oncology, Neurosciences, Orthopedics and Rehabilitation Services.

Miksit comes to Valley Health from The Christ Hospital in Cincinnati, Ohio, where she served as executive director of the heart and vascular service line. She also brings several years of experience in operations and management from other healthcare systems across Ohio, Pennsylvania, and New Jersey.

Miksit graduated from Cleveland’s MetroHealth Center as an RN and holds a Bachelor of Science in Nursing from Ursuline College in Ohio and an MBA from Cleveland State University.

Mary Sas, MSHCM, MBA
Vice President, Hampshire Memorial Hospital

Mary Sas

Mary Sas is vice president of Hampshire Memorial Hospital.

Prior to joining Hampshire Memorial Hospital as the director of Clinical Services, she served as the chief nursing officer for Fairfield Memorial Hospital in South Carolina and as an emergency department nurse manager at Lexington Medical Center and night administrator at Palmetto Health in South Carolina.

Sas has a Bachelor of Science in Education and a Bachelor of Science in Nursing from the University of South Carolina. She received her Master of Science in Health Care Management and MBA from the University of Phoenix. She is a Board Certified emergency nurse.

Kevin S. Sheppard, MHA
Vice President of Operations-Clinical Services, Winchester Medical Center and Valley Health

Kevin S. Sheppard

Kevin S. Sheppard is the vice president of Operations-Clinical Services for Winchester Medical Center (WMC) and Valley Health. He has executive responsibility for systemwide clinical services, including Imaging, Laboratory, Pharmacy and Respiratory, along with non-clinical departments of Facilities and Information Systems. Sheppard supports Acute Care Surgical Services at WMC and Warren Memorial Hospital.

Sheppard spent 17 years with Ohio’s Bon Secours Health System, starting in finance and moving into various operations and executive leadership roles. He has also served as vice president of operations, vice president of ambulatory services, vice president of population health, and interim chief executive officer for St. Francis Medical Center and St. Mary’s Hospital, both in Virginia.

Sheppard graduated from the University of Alabama with a Bachelor of Science in accounting. He later earned his Master of Health Administration from the University of Minnesota.

Heather SigelHeather Sigel, MBA
Vice President, War Memorial Hospital

Heather Sigel is the vice president of War Memorial Hospital and has been with Valley Health since 2014. She previously served as the War Memorial Hospital director of Clinical Services. Heather has been involved in healthcare for over 20 years and has served in numerous clinical and leadership roles.

Sigel received a bachelor’s degree in nursing from The Pennsylvania State University and a Master of Business Administration from Mount St. Mary’s University.

Matthew Toomey, JD
Vice President, Patient Financial Services

Matthew Toomey, JD

Matthew T. Toomey, JD, transitioned to vice president, client delivery at Ensemble Health Partners in January 2023. Previously, he joined Valley Health in 2015 as vice president, Patient Financial Services, focused on optimizing technology and creating opportunities for service excellence. Toomey was previously director of Patient Financial Services at Johns Hopkins Health System and a senior consultant with O’Boyle, Inc., in Baltimore, providing healthcare clients with revenue cycle review, project management and accounts collections.

Toomey earned a Juris Doctor degree from The Columbus School of Law at The Catholic University of America, where he also completed his bachelor’s degree.

William "John" Zehner, MD
Vice President, Medical Affairs, Page Memorial Hospital and Shenandoah Memorial Hospital

Zehner

William “John" Zehner, MD, is the vice president of Medical Affairs for Page Memorial Hospital and Shenandoah Memorial Hospital.

Dr. Zehner provides primary oversight for patient safety, quality of care improvement, medical staff engagement, and documentation accuracy. He is responsible for implementing efficiencies and reducing variation in our clinical care models as Valley Health continues on its journey to High Reliability. He is also an attending physician in the Emergency Department.

Dr. Zehner graduated from the Medical College of Pennsylvania where he completed his residency and fellowship in emergency medicine services. He served as Emergency Department medical director and president of the medical staff at Shenandoah Memorial Hospital.

Valley Health System Board of Trustees

  • Harry Smith – Chair
  • Thomas T. Gilpin – Vice Chair
  • Steven E. Cluss – Secretary
  • Jeff Boehm
  • Julia M. Connell
  • James G. Dale, DO
  • Chad Dansie, MD
  • Melody Eaton, PhD, MBA, RN, CNE, FAAN
  • Marie Imoh
  • Katherine Johnson, MD
  • Tom Leslie, DDS
  • Mark Nantz, MHA, President and CEO
  • Mary Beth Price
  • Clifton L. “Kip” Rutherford
  • Charles Turnbull, MD
  • Thomas Wise, MD