The Chief Medical Information Officer (CMIO) is a senior executive responsible for aligning clinical practice with health information technology strategy. They oversee clinical informatics programs, guide EHR optimization, ensure regulatory compliance, and lead digital transformation initiatives. Responsibilities include policy development, governance oversight, quality performance monitoring, stakeholder engagement, and strategic vendor evaluation. CMIOs ensure digital systems support evidence-based care, patient safety, interoperability, and operational efficiency. Work settings include large hospitals, academic medical centers, national health systems, and integrated delivery networks. Global demand is increasing as healthcare organizations prioritize enterprise-level digital strategy and clinician-led informatics governance.