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Leadership

Learn more about the leadership of HCA Houston Healthcare.

Troy A. Villarreal, FACHE

President

As president of HCA Healthcare’s Gulf Coast Division and HCA Houston Healthcare, Troy A. Villarreal is responsible for the management and operations of hospitals, emergency and surgical centers, and diagnostic facilities from Conroe to Texas City, as well as Houston to Corpus Christi and south Texas.

He was appointed to his current position in July 2016 after serving as chief executive officer of Medical City Dallas Hospital and chief executive officer at The Medical Center of Plano, both part of the HCA Healthcare system.

As president of HCA Healthcare’s Gulf Coast Division and HCA Houston Healthcare, Villarreal has been responsible for major facility upgrades, significant growth, and increased patient, physician and employee satisfaction at numerous HCA Healthcare hospitals.

He earned his bachelor’s degree in psychology from Texas A&M University and master’s degrees in healthcare administration and business administration from the University of Houston-Clear Lake. He is a fellow in the American College of Healthcare Executives and serves on the UHCL Healthcare Administration Executive Advisory Board, the Texas Hospital Association’s Council on Policy Development Board and the Greater Houston Partnership Board.

Villarreal is a graduate of Leadership Plano Class 27, having served on the organization’s executive committee board, strategic planning committee and alumni committee. He also served as campaign cabinet chair for the Plano Chamber of Commerce and as an advisory board member of the United Way of Greater Dallas.


Evan Ray, FACHE

Executive Vice President and Chief Administrative Officer

Evan Ray, FACHE, has served as the executive vice president and chief administrative officer of HCA Healthcare’s Gulf Coast Division and HCA Houston Healthcare since April 2019. In his role, Ray focuses on expanding HCA Houston Healthcare’s service footprint with an integrated approach to network access, regional outreach, hospital operations and strategic planning. His scope of responsibility supports quality, service and growth goals spanning hospital operations, ambulatory surgery centers, urgent care operations as well as emergency services, human resources, marketing, construction and real estate.

Before coming to HCA Houston Healthcare, Ray served as president of St. Vincent’s Birmingham and St. Vincent’s Chilton hospitals, a division of Ascension Health, in Birmingham, Alabama. In this position, he integrated and aligned physician enterprises, expanded care delivery centers, enhanced programs and provided oversight to all essential access points throughout the St. Vincent’s health system. His leadership expanded multiple service lines, improved patient care, strengthened physician engagement and enhanced emergency services. Ray began his career at St. Vincent’s Health System in 2012, serving as President of St. Vincent’s Blount and St. Vincent’s St. Clair hospitals. He launched several multi-campus hospital and service line expansions, developing physician alignment initiatives that enabled the expansion of quality offerings for the community.

Prior to joining St. Vincent’s Health System and Ascension Health, Ray served in Hospital Executive Leadership roles from 2005 – 2012 in Alabama, Iowa & South Carolina.

Ray earned a bachelor’s degree in finance and economics from Mississippi State University, as well as master’s degrees in business administration and health administration from The University of Alabama at Birmingham. As associate member and fellow of the American College of Healthcare Executives, Ray’s accomplishments have been recognized by the Birmingham Business Journal as a “Birmingham Healthcare Leader to Know” from 2012-2018. He was also an esteemed member of the Birmingham Business Journal's 2016 "Top 40 under 40." In Houston, Ray serves the community through participating at the board level for the American Heart Association and The Center for Houston's Future.


Jeffery L. Sliwinski

Chief Financial Officer

Jeffery L. Sliwinski was appointed chief financial officer (CFO) of HCA Healthcare’s Gulf Coast Division and HCA Houston Healthcare in May 2012.

Sliwinski has held various financial roles in healthcare, having served as CFO at The Woman’s Hospital of Texas and controller of the HCA Healthcare’s Gulf Coast Division. His prior experience also includes financial positions at Baptist Memorial Healthcare System in Memphis, Tennessee and The Children’s Hospital of Buffalo, New York.

Sliwinski earned a bachelor’s degree in business administration with a concentration in accounting from the State University of New York at Buffalo. He serves on the Northern Brazoria County Education Alliance Board of Directors and is treasurer of the Pearland Independent School District Booster Club.


Andrew Moore, MD, MSHLM, FAAOS, CPE

Chief Medical Officer

Dr. Andrew Moore was named chief medical officer (CMO) for HCA Healthcare's Gulf Coast Division and HCA Houston Healthcare in April 2023. In his role, Dr. Moore provides leadership over clinical quality, patient safety, medical staff oversight and high reliability across 19 hospitals and affiliated healthcare entities. He works diligently to fulfill the HCA Healthcare mission of “Above all else, we are committed to the care and improvement of human life” through purposeful application of proven tactics and continuous process improvement.

Dr. Moore brings more than 25 years of clinical and leadership experience with a proven track record of success. Most recently, Dr. Moore served as chief medical officer for the St. David’s Enterprise in Austin, Texas. Under Dr. Moore’s tenure, St. David’s Medical Center was named the #1 Large Community Hospital in the United States by Fortune Magazine and Merative (formerly IBM Watson Health) in 2022. Additionally, St. David’s Medical Center was the last hospital in Texas to maintain straight “A” ratings by the Leapfrog Group. Furthermore, all hospitals maintained the highest Centers for Medicare and Medicaid Services (CMS) 5-star ratings during his tenure.

Dr. Moore is a retired board-certified orthopedic surgeon who served in private practice in Austin after completing a distinguished career of service in the United States Air Force, from which he retired as a Colonel. Dr. Moore served our country in combat as an orthopedic trauma surgeon in Iraq in 2006 and 2008, in addition to multiple humanitarian medical missions across the world. He also served in multiple command positions within the Air Force, including chief of medical staff, squadron commander, and group commander, equivalent to serving as a hospital chief executive officer. At the time of his retirement from the Air Force, Dr. Moore was awarded the Legion of Merit for exceptionally meritorious conduct in outstanding services and achievements.

Dr. Moore is a Distinguished Graduate of the United States Air Force Academy having received his nomination from President George H. W. Bush. He attended medical school at Texas A&M University Health Science Center, where he was elected class president. After completing a transitional internship and serving a tour as an Air Force flight surgeon, Dr. Moore completed a residency in orthopedic surgery at Yale University. Most recently, he earned a Master of Science in Healthcare Leadership and Management from the University of Texas at Dallas. Dr. Moore also serves as an adjunct professor with the Texas A&M College of Medicine, fellow of the American Academy of Orthopedic Surgeons, member of the American College of Healthcare Executives and previously on the board of directors for the Society of Military Orthopedic Surgeons.


Kelli Nations, DBA, MHA, BSN, RN, NE-BC

Chief Nursing Executive

In 2016, Kelli Nations was named the first chief nurse executive (CNE) of HCA Healthcare's Gulf Coast Division and HCA Houston Healthcare.

Nations’ role as CNE is to set a new standard of care for patients across the Greater Houston Area, Corpus Christi and the Rio Grande Valley. Through collaboration with HCA Healthcare teams across the country, as well as with local community leaders, Nations defines the roadmap to a better care experience managed by a compassionate, highly skilled nursing workforce. She was instrumental in the development of the $3.5 million gift to the University of Houston College of Nursing and drives all levels of care provider programs, from high school to graduate education.

Nations holds a Doctorate in Business Administration with a focus in Organizational Development from Northcentral University, as well as a bachelor’s degree in nursing and a master’s degree in healthcare administration from Texas Woman’s University in Houston. She is certified through the American Nurses Credentialing Center as a Certified Nursing Executive.

Nations is proud to continue her commitment to improving the field of nursing through her participation on the following boards: March of Dimes, Good Samaritan Nursing Foundation and University of Houston College of Nursing advisory council.

With over 20 years of nursing experience with HCA Healthcare, Nations served as a nursing leader at HCA Houston Healthcare Clear Lake, Conroe, Southeast and Mainland. She believes that what matters most to our diverse and talented colleagues is giving people the absolute best healthcare possible. Every day, we seek to raise the bar higher, not just for ourselves, but for healthcare everywhere.