HCA Houston Healthcare West is led by a team of more than 1,200 employees and 400 physicians.

Meet our Senior Leadership Team

Megan Marietta, Chief Executive Officer

Megan Marietta serves as the Chief Executive Officer of HCA Houston Healthcare West. Marietta currently serves as a member of the Houston West Chamber of Commerce Board of Directors. Marietta has received several honors and accolades, most recently honored for her dedication and commitment to the community and named the 2016 FamilyTime Women of Achievement in Medicine.

Previously Marietta served as Chief Operations Officer of HCA Houston Healthcare Kingwood. During her tenure, she oversaw a freestanding emergency room, two Observation Units, two ER expansions, a Neuro Cath Lab expansion and Neurosurgery expansion.

Prior to her tenure at HCA Houston Kingwood, Megan served in an Associate Administrator role at The Woman's Hospital of Texas after completing her administrative residency.

Philip Morris, Chief Operating Officer

Philip Morris is the Chief Operating Officer at HCA Houston Healthcare West in Houston, TX. In this role, Philip is responsible for providing oversight to all operational and ancillary departments as well as providing strategic leadership for service line development and capital efforts.

Prior to joining West, Philip worked as Associate COO at Research Medical Center in Kansas City, MO. Philip has also served in a variety of administrative leadership roles in academic medicine (Stanford Health Care & Georgetown University Hospital) as well as the safety net setting (Alameda Health System).

Philip earned his masters of health systems administration from Georgetown University and a BS in health sciences from Furman University. He is also an active member of the American College of Healthcare Executives and the National Association of Health Services Executives.

Gregg Garrison, Chief Financial Officer

Gregg received his BSBA degree from Central Missouri State University with a major in Accounting. Gregg also completed his graduate studies at Central Missouri State University where he earned a Masters Degree in Business Administration.

Prior to moving into the healthcare field, Gregg spent 6 years in public accounting where he focused on Business Services. Gregg has been in the healthcare field for the last 28 years where he has held various hospital financial management positions. Gregg spent 12 years with Tenet Healthcare as a hospital controller and Chief Financial Officer, before moving to HCA in 2005 as the Chief Financial Officer at Spring Branch Medical Center in Houston, Texas.

Gregg is currently the Chief Financial Officer at HCA Houston Healthcare West a position he has held since 2009. Gregg is a licensed CPA in the State of Kansas and is a member of the American Institute of Certified Public Accountants as well as the Texas Society of CPAs.

Tashauna McCray, Chief Nursing Officer

Dr. McCray oversees the clinical, operational, strategic, and financial performance of the hospital's nursing service line. Previously, she served as CNO of Cypress Fairbanks Medical Center and held a range of nursing positions - emphasizing transformative care delivery, performance improvement, and physician relationships to improve patient outcomes. McCray has a BSN from the University of Arkansas-Monticello, a master's in nursing from UTMB-Galveston, a doctorate in nursing from Texas Tech University-Lubbock, and a MBA from Prairie View A&M University.

Meet our Board of Trustees

HCA Houston West's board of trustees, comprised of highly-respected physicians and business leaders, evaluates the hospital's delivery of healthcare and helps develop new programs to ensure that our patients receive the most advanced, cost-effective healthcare close to home.

Stephen Mahoney, M.D., Chairman of the Board

Dr. Stephen Mahoney is a dermatologist at HCA Houston West. The long time Houstonian graduated from Memorial High School and graduated with honors from the University of Notre Dame.

Dr. Mahoney received his medical degree from the University of Texas Southwestern in Dallas and completed his dermatology residency at the University of Texas at Houston. He has received extensive training in medical, surgical and cosmetic dermatology. Dr. Mahoney has been in private practice at West Houston Dermatology since 1993.

Dr. Mahoney is certified by the American Board of Dermatology and is a Fellow of the American Academy of Dermatology. He holds an academic appointment as Clinical Assistant Professor of Dermatology at the University of Texas Medical School at Houston.

He has served on several national dermatology advisory boards, and lectures regionally on a wide range of topics. He is the medical director of cosmetic services at Advanced Aesthetic Institute (AAI), an aesthetic laser leading company.

Jeannie Bollinger

Jeannie is CEO and President of the Houston West Chamber of Commerce, a business membership organization with over nine hundred business members representing approximately 50,000 employees in West Houston.Prior to joining the Houston West Chamber of Commerce, Jeannie served as the Manager of Administration for AquaSource, Inc., a nationwide water utility.

Jeannie holds a master's degree in Counselor Education from Florida International University in Miami and a Bachelor of Science in Psychology from the University of North Carolina at Pembrook. She is recognized in Who's Who - International, American Women, American Business Women and Southern Women. In 2011 she was recognized by the International Women's Network on International Women's Day for her creation of Women Driving Business a unique series of networking events designed exclusively for women business owners and "C" level executives.

Currently Jeannie serves on the HCA Houston West Board of Directors, Westchase District Advisory Council, Spring Branch ISD Partners in Education Board and the Business Development Advisory Board of American InterContinental University. She was named as one of the "Top 50 Most Influential Women in Houston" by Houston Women Magazine in January of 2014.

Jeannie is married to Erik Hedegaard and has a daughter, Dylan, and two step children, Erika and Conor.

H.D. Chambers

H.D. Chambers has devoted more than 25 years to public education in Texas. Prior to taking on a leadership role as superintendent of schools for Alief ISD in the spring of 2011, H.D. served as superintendent for Stafford Municipal School District.

H.D. began his career in education at Aldine ISD as a teacher and coach. He then served 14 years at Cypress-Fairbanks ISD in campus and central administration before joining Stafford in 2006.

H.D. holds leadership positions in the following:

  • Texas Association of Suburban/Mid-Urban Schools (TAS/MUS), President
  • International Management District, Board member
  • Texas School Alliance, Board Member
  • Texas Select Committee on Student Performance and Accountability, Member
  • Houston West Chamber of Commerce Governmental Affairs Committee, Member
  • Houston Westchase Rotary Club, Member

Sarah Cain

From a small town in Texas named Columbus, Sarah arrived in Houston in 1981. Starting Sarah's Florist in 1987, she became one of the top 500 florists worldwide and was chosen the Women of the Year in her industry through the National Association of Professional and Executive Women. Sarah has been in numerous magazines and was featured on the cover of the Small Business Today Houston Magazine.

Sarah is founder and chair of the Women Driving Business Series, a series of uniquely inspirational business events intended to provide opportunities to connect and promote key West Houston women business owners and "C" level corporate executives, providing opportunities to network, connect and promote business.

Julie Baker Finck, Ph.D.

Julie Baker Finck, Ph.D., President for the Barbara Bush Houston Literacy Foundation, has more than 20 years of experience in the field of K-12 education. Prior to this role, Dr. Finck served on the executive leadership team of the Houston Independent School District as Chief Academic Officer and Chief Major Projects Officer.

She has served in leadership positions at both a regional and state level in Ohio leading large-scale, education reform initiatives. Prior to her move to Houston, she served as a senior director at Battelle for Kids, a national nonprofit organization. Dr. Finck began her career as a middle school teacher in Kentucky. She earned her Doctorate of Philosophy in education administration from Ohio State University.

Michael Griffin

Michael Griffin is a Partner with SilverOak Financial Group, a financial planning and asset management firm based in Houston. Michael has served a number of civic and charitable organizations, including as a board member of the Houston-West Chamber of Commerce; a board member of the Houston Business and Education Committee; as well as a board member of Camp For All. He resides in Katy with his wife and two children.

Darius Wania, M.D.

Dr. Darius Wania is an Internal Medicine physician at HCA Houston West.

Dr. Wania was born in Karachi, Pakistan, and received his medical degree from Dow Medical College in 1988. After completing internships in General Surgery and Internal medicine, Dr. Wania served as Resident Medical Officer at Ziauddin Hospital in Karachi.

In 1992, Dr. Wania arrived in Houston for an externship at Texas Children's Hospital, followed by a residency at Cook County Hospital in Chicago, IL. Since 1995, Dr. Wania has served the West Houston community at his Alief-based medical clinic.

Dr. Wania's achievements include being elected Chief-of-Staff at HCA Houston West in 2007 and Chairman of Medicine at HCA Houston West in 2005. He is a member of the American Medical Association and the Texas Medical Association. He is also Diplomate of the American Board of Internal Medicine, and his practice philosophy is to provide personal patient care with an emphasis on preventative medicine.

Troy A. Villarreal, President, HCA Gulf Coast Division

Troy A. Villarreal joined HCA Gulf Coast Division as President in June 2016 from Medical City Dallas Hospital, where he had been chief executive officer since October 2013. Before that, he was the chief executive officer at The Medical Center of Plano for five years.

He earned his bachelor's degree in psychology at Texas A&M University and master's degrees in healthcare administration and business administration at the University of Houston-Clear Lake. He is a fellow in the American College of Healthcare Executives.

Villarreal has a strong history of community service. He is a graduate of Leadership Plano Class 27 and formerly served on the executive committee board, strategic planning committee and alumni committee of Leadership Plano. He also has served on the board of the Plano Chamber of Commerce as campaign cabinet chair for Collin County and as a member of the advisory board of the United Way of Greater Dallas.

Since joining HCA in 1993, Villarreal has been responsible for major facility upgrades, significant growth and increased patient, physician and employee satisfaction at a variety of HCA hospitals.