This course examines the historical development and transformation of integrated behavioral healthcare, tracing its roots from early calls for holistic care in the 1920s to modern-day collaborative care models. Students will explore key milestones, including Adolph Meyer’s advocacy for the biopsychosocial approach, the de-institutionalization movement of the mid-20th century, and landmark policies such as the Mental Health Parity and Addiction Equity Act and the Affordable Care Act. Through lectures and discussions, learners will analyze how societal attitudes, research findings, and policy reforms shaped integration efforts over time. The course also highlights the evolution of care settings: from institutional models to community-based and technology-driven approaches and examines the persistent gaps that continue to influence implementation today. By the end of this course, participants will understand the historical context, systemic changes, and cultural shifts that underpin integrated behavioral health, preparing them to apply these insights in leadership and practice.