LaSharndra “Sharn” Barbarin
Chief Executive Officer of the Medical City Lewisville
Barbarin served as the chief operating officer at Medical City Arlington from 2011 until her appointment as chief executive officer at Lewisville in July 2015. Under her leadership, Medical City Arlington expanded services and achieved outstanding patient and physician satisfaction scores.
She began her career with HCA as an administrative Fellow at Medical City Las Colinas and was quickly promoted to chief operating officer at Medical City McKinney where she served nine years before her promotion to chief operating officer at Medical City Arlington.
Barbarin is a graduate of Louisiana State University and has a Master of Health Administration from Tulane University. Her honors include: Outstanding Alumni by Tulane University School of Public Health and Tropical Medicine, Top 25 Women in Business by McKinney Living, and Young Healthcare Executive of the Year Nominee by the Dallas-Fort Worth Hospital Council.
Chief Executive Officer of Medical City Green Oaks Hospital
Appointed to the position in 1993, Collins directs the 124-bed Medical City Green Oaks Hospital and facilities that include a unit at Medical City McKinney, clinics in Las Colinas and Plano, and an integrated care clinic at Medical Center of Dallas.
Collins established the first and one-of-a-kind 24/7 psychiatric emergency room, which serves as the front door for the seven-county NorthSTAR program. He was also instrumental in creating the Behavioral Health Leadership Task Force to bring providers together to collaborate on various issues, make improvements in the provider system, and to communicate with legislators.
Prior to joining HCA, Collins held a similar position with Fairview Hospital in Minneapolis where he worked his way up through the organization starting as a mental health tech at age 17 while pursuing his undergraduate degree at Augsburg College. He has worked in the mental health field for over 40 years.
Tom’s contributions to the community have been recognized with two Prism Awards, the Dallas NAMI Award, the Collin County NAMI Award, and a “Mister Community Award” from the Dallas Police Crisis Intervention Team (“CIT”) program.
Daniela “Dany” Decell, FACHE
Chief Executive Officer of Medical City Las Colinas
Since her appointment in 2005, Decell has been instrumental in leading Las Colinas’ growth by creating a culture and vision that fosters a healthy work environment and ensures quality outcomes for the patients. Las Colinas has been recognized by The Texas Medical Foundation for The Texas Healthcare Quality Improvement Award of Excellence in 2008, 2009, and 2010, and has achieved Chest Pain level II Accreditation.
She began her management career with HCA at Medical City Fort Worth as the director of the neuroscience service line. She advanced to the position of chief nursing officer in 1997 and chief operating officer in 2000. She began her career in health care as a critical care nurse at Saint Joseph Hospital.
Decell has a bachelor’s degree in nursing from Texas Christian University and a master’s degree in nursing administration from the University of Texas at Arlington. She serves on several boards including the Irving Economic Development Council, The Irving Chamber Workforce Enrichment Council, and the Dallas-Fort Worth Hospital Council. She was named a YWCA Tribute to Women in Business recipient in 2000 and a Business Press Healthcare Hero in 2002.
Steven Edgar, FACHE, PT
Chief Executive Officer of Medical City Denton
Edgar joined Medical City Denton in July 2016. Edgar came to North Texas from Wesley Woodlawn Hospital, a 99-bed acute care hospital in Wichita, Kansas after serving four years as CEO. During his tenure at Wesley Woodlawn he achieved outstanding patient satisfaction and employee engagement, and expanded service lines including ER, cardiology, and surgical services.
Edgar holds a Bachelor’s Degree in Health Science-Physical Therapy from the University of Missouri, Columbia, and a Master of Public Administration – Health Administration, from University of Missouri, Kansas City. He is a Fellow of the American College of Healthcare Executives.
Charles E. Gressle
Chief Executive Officer of Medical City Plano
Gressle was named to his current position in November 2013. Prior to his post at Medical City Plano, he held other executive positions with HCA. Gressle has served as chief operating officer at Medical City Dallas Hospital and Medical City Children’s Hospital, senior vice president of Strategy and Business Development for the HCA Continental Division in Denver, Colorado, and as the chief operating officer at The Woman’s Hospital of Texas.
Charles started his health care career as a Certified Nursing Assistant and nationally registered EMT-Paramedic.
He received his undergraduate degree from The University of North Carolina at Chapel Hill and his master’s degree with Highest Honors from Wake Forest University.
Chief Executive Officer of Medical City Weatherford
In 2018, Sean Kamber was named chief executive officer at Medical City Weatherford. Prior to entering this role, Kamber served as vice president of rural and community outreach for HCA Healthcare’s Gulf Coast Division, identifying and developing strategic opportunities for collaboration in the secondary and tertiary service areas.
In addition, Kamber served as chief operating officer at Weatherford Regional for three years. In which time, he helped improve CMS hospital ratings, increased growth in adjusted admissions and surgery, and completed the joint venture acquisition for the imaging center.
Kamber brings more than 12 years of healthcare experience to the role. His career began as division manager for a urology group and he quickly advanced to higher-level leadership roles, including director of operations at Texas Health Resources and assistant administrator at Laredo Medical Center.
Kamber received a Master of Science in Health Care Administration from Trinity University and holds an undergraduate degree from the Texas Tech Rawls College of Business.
Chief Executive Officer of Medical City McKinney
Lynch was named to his current post in 2002. Prior to that, his leadership served other HCA affiliates in the roles of chief operating officer at Medical City Plano, chief executive officer at Medical Center of Lancaster, and chief operating officer at Longview Regional Medical Center.
He brings over 28 years of experience in healthcare administration to his position. During his career he has served in various capacities both in for-profit and not-for-profit settings. In addition, his experience ranges from large tertiary systems to small community facilities.
Prior to joining HCA in 1996, Lynch served the Lubbock Methodist Hospital System. During his 10-year tenure, he served in capacities ranging from administrative resident to senior vice president.
Chris Mowan, MBA, FACHE
Chief Executive Officer of Medical City Dallas
Mowan joins Medical City from Las Vegas, Nevada, where he has served three years as CEO of MountainView Hospital, a complex teaching hospital. During his tenure at MountainView, he oversaw a $90-million facility expansion, achieved unprecedented ER growth and launched graduate medical education programs.
Mowan’s career with HCA spans more than 20 years, starting with roots as an HCA manager to roles as COO at Del Sol Medical Center in El Paso and as COO at Sunrise Medical Center and Children’s Hospital in Las Vegas, which was ranked as the #1 facility in Nevada by U.S. News & World Report under his leadership. In North Texas, Mowan was instrumental in developing the intern and resident teaching program at Medical City Fort Worth, which continues to develop physicians today.
Mowan is a graduate of Indiana University and holds a Master’s degree in Business Administration from Southern Methodist University. He is a Fellow of the American College of Healthcare Executives.
Chief Executive Officer, Medical City Children’s Hospital and Medical City Women's Hospital Dallas
O'Neal was named chief executive officer of Medical City Children’s Hospital and Medical City Women’s Hospital Dallas, in December 2018.
From 2016 to 2018, O’Neal served as chief operating officer of the 515-bed West Florida Hospital in Pensacola, Fla. Under O’Neal’s leadership, pediatric specialty care network services and providers were integrated into West Florida Hospital’s delivery system and she launched a wide spectrum of pediatric services including orthopedics, cardiology, pulmonology, ENT, GI, urology and imaging services.
O’Neal previously served as VP of operations and chief operating officer of Methodist Dallas Medical Center, where she oversaw surgical services, oncology, neurosurgery, cardiology, radiology, weight management, respiratory therapy, food services, environmental services, physical plant, the GI lab, communications, police and volunteer services.
O’Neal holds a Master of Science in Health Care Administration from Trinity University and a Bachelor of Science in Nutrition/Dietetics from Texas Christian University.
Chief Executive Officer of Medical City Fort Worth
Sims was named chief executive officer at Medical City Fort Worth June 2017. Since 2014, Sims has served as senior vice president and chief operating officer at Hospital Corporation of America’s (HCA) Tulane Health System, where he was responsible for daily operations of two acute care hospitals with over 500 beds and 35 hospital based clinics. His leadership is credited with remarkable improvements in patient experience, service line growth and recruitment of top talent to the organization. He led more than $50 million in construction and capital improvements and exhibited a commitment to the community, having served on multiple community boards including the Louisiana Chapter of the American College of Healthcare Executives.
Sims brings more than 17 years of healthcare experience to the role. He joined HCA in 2011 serving as chief operating officer of St. Lucie Medical Center in Port St. Lucie, Florida, and Associate Chief Operating Officer at Clear Lake Regional Medical Center in Webster, Texas.
Sims received a Master of Health Administration from the University of Arkansas for Medical Sciences (UAMS) and holds an undergraduate degree from Louisiana State University (LSU). He was also awarded the 2016 UAMS Alumnus of the Year and in 2015 the Modern Healthcare Up and Comer Award.
Chief Executive Officer of Medical City North Hills
With 18 years of healthcare leadership experience, Villarreal joined HCA after his tenure at CHRISTUS Health where he served as the vice president and chief operating officer of CHRISTUS Spohn Shoreline and Memorial Hospitals in Corpus Christi, Texas. Prior to joining CHRISTUS Spohn he served for seven years as the CEO of Navarro Regional Hospital, a 162-bed acute care hospital in Corsicana Texas, and as COO at Abilene Regional Medical Center in Abilene, Texas. Xavier worked for Hillcrest HealthCare System in Tulsa, Oklahoma for eight years during which he served as CEO at the Eastern Oklahoma Medical Center in Poteau, Oklahoma and Fairfax Memorial Hospital in Fairfax, Oklahoma.
Villarreal received his BBA in Accounting at Texas A&M University in College Station, Texas and his Masters in Healthcare Administration at Trinity University in San Antonio. He has led statewide health care efforts and currently serves on both the Texas Hospital Association and the HOSPAC boards of directors. He is a Fellow of the American College of Healthcare Executives.
Glenn Wallace, CPA
Chief Executive Officer of Medical City Alliance
Wallace assumed his leadership role at Medical City Alliance in January 2014. He brings more than more than 25 years of experience in the health care field, and has served HCA in financial positions at several other locations.
He came to Alliance from Medical City Plano, where he was the chief operating officer. Prior to that, he served as the chief financial officer and chief operating officer at Medical City North Hills. He also was the chief financial officer at Medical City Las Colinas and controller at Plaza Medical Center and Medical City Arlington.
Throughout his career with HCA, Wallace has overseen significant hospital growth including opening Medical City Las Colinas and overseeing major expansion projects at both Medical City Plano and Medical City North Hills.
Wallace earned his bachelor’s degree in business administration from Stephen F. Austin State University and his master’s degree in business administration from Texas Christian University.
Keith V. Zimmerman
Chief Executive Officer of Medical City Arlington
Zimmerman was named CEO at Medical City Arlington April 1, 2017. Prior to his role at Medical City Arlington, Zimmerman served as chief executive officer of Medical City Children's Hospital since December 2012. He brings 23 years of healthcare experience to his leadership. Zimmerman joined Medical City Dallas as chief development officer in January 2011.
Prior to Medical City, Zimmerman was the system vice president of business development at OhioHealth in Columbus, Ohio. Before his tenure at OhioHealth, Zimmerman held multiple operational and business development roles in healthcare.
Zimmerman earned his undergraduate degree in business administration at the University of Louisiana and holds a Master of Business Administration in Health Care Management with Graduate Honors from Regis University in Denver, Colorado.