In this episode of OT Conversations, Hao, an occupational therapist, delves into the historical progression of occupational therapy (OT) theory and practice models. Starting from the post-World War II era, Hao explores the inception of the biomechanical frame of reference and touches on foundational models like PNF, Bobath, and the Rood approach. He discusses influential figures, such as Mary Riley, who called for a return to occupational roots, leading to the development of the Model of Human Occupation (MOHO) by her student Gary Keilhofner. The discussion extends into the 1970s' focus on sensory integration by Jean Ayres and key scales like the Ranchos Amigos and Glasgow Coma Scale. It continues into the 1980s and 1990s with models emphasizing client-centered practices and environmental contexts like the Canadian Model of Occupational Performance (CMOP) and the Ecology of Human Performance. Finally, Hao highlights the shift towards culturally responsive care with the 2006 introduction of the Kawa model by Michael Iwama. The episode underscores the importance of appreciating the historical context and foundational models that shape current OT practices.