Leadership
At HCA Houston Healthcare West, our experienced and knowledgeable leadership team is committed to improving the quality of care and helping our community.
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.
Amica Ghebremariam
Chief operating officer
Amica Ghebremariam has served as the Chief Operating Officer (COO) at HCA Houston Healthcare West since January 2025. In her role, she is responsible for providing oversight to all operational and ancillary departments as well as providing strategic leadership for service line development and capital efforts.
Before joining HCA Houston West, Ghebremariam served as the Associate Chief Operating Officer at HCA Houston Healthcare Kingwood. During her tenure at the hospital, Ghebremariam oversaw critical departments such as Plant Operations, Cardiac Cath Lab and Inpatient Rehabilitation. Her leadership and business development strategies resulted in growth in key service lines, including robotic and bariatric surgery, as well as enhanced operational efficiency throughout the organization.
Ghebremariam is a graduate of Trinity University, where she earned her Master of Science in Healthcare Administration. She also holds a Bachelor of Science in Biomedical Sciences from Texas A&M University. A member of the American College of Healthcare Executives (ACHE), Ghebremariam has further honed her leadership skills through the HCA Healthcare Executive Development Program.
Kenny Russo
Chief financial officer
Kenny Russo is the Chief Financial Officer at HCA Houston Healthcare West. In this role, he is responsible for managing financial operations and will analyze and explore means of reducing hospital operating costs and increasing revenues.
Before joining HCA Houston West, Russo served as the chief financial officer at Hill Regional Hospital in Hillsboro, TX, and at The Woman's Hospital of Texas. He serves on the board of directors for The Immunization Partnership and has a certified healthcare finance professional certification from the Healthcare Financial Management Association.
Russo received his bachelor in business administration from The University of Texas at Austin with a major in finance and minor in accounting. He earned his master's degree in business administration from Hardin-Simmons University in Abilene, TX.
John Mier
Chief Nursing Officer
John Mier, MBA, BSN, RN, serves as Chief Nursing Officer (CNO) at HCA Houston Healthcare West. He oversees the clinical, operational, strategic and financial performance of the hospital's nursing service line.
Mier has more than 24 years of nursing experience and a demonstrated history of success in nursing engagement, patient experience, physician collaboration and growth in key hospital service lines. Before joining HCA Houston West, he previously served as the Chief Nursing Officer at Texas Orthopedic Hospital (TOH) and was instrumental in leading the hospital to advanced certification for Total Hip and Knee through the Joint Commission. Under his leadership, TOH received HCA Healthcare Unit of Distinction awards (2019-2022), Press Ganey’s Guardian of Excellence awards for patient experience (2019-2022), and the top RN engagement score within HCA and Becker’s Hospital Review Top Hospital for Nursing Communication and Staff Responsiveness (2023).
Mier earned his Master of Business Administration (MBA) from University of Phoenix and his Bachelor of Science in Nursing (BSN) from Lamar University in Beaumont, TX.