West Hills Hospital and Medical Center Mark Miller has been the president and chief executive of West Hills Hospital and Medical Center since December 2018. Miller has held several HCA Healthcare executive positions including chief operating officer of Grand Strand Health in HCA’s South Atlantic Division and chief executive at Lake City Medical Center in HCA’s North Florida Division. Miller is a member of the American College of Healthcare Executives and the National Association of Health Services Executives. He serves on the board of the Calabasas Chamber of Commerce. ALMA MATER: Middle Tennessee State University.