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Learn more about the leadership of HCA Houston Healthcare.

Troy A. Villarreal, FACHE


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.

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.

Michelle Bookout, DNP, MSN, RN, NEA-BC

Chief Nurse Executive

Michelle Bookout was named chief nurse executive (CNE) for HCA Healthcare's Gulf Coast Division and HCA Houston Healthcare in March 2024. In this role, she will continue improving the care experience for patients across the Greater Houston area, Corpus Christi and the Rio Grande Valley.

With over 28 years of executive leadership, Bookout brings to the division a focus on high-quality care outcomes, excellent patient satisfaction scores and high team engagement. Over the years, she has held many leadership roles including administrative director of nursing services, director of critical care services, director of telemetry, adjunct professor at Loyola University Medical Center and professional development coordinator.

She earned her bachelor's degree in nursing from West Suburban College of Nursing in Oak Park, Illinois, a master's degree in nursing from Saint Xavier University in Chicago and a doctorate in nursing practices-systems leadership from RUSH University Medical Center in Chicago.

Bookout serves as a voting board member for the South Florida Nursing Consortium and a director-at-large for the Nevada Nurses Association State Board. Her certifications include Nurse Executive Advanced Certification, American Nurses Credentialing Center (ANCC) and Green Belt Six Sigma from Vanderbilt University.