This chapter synthesizes key themes and insights from international case studies on PD for EMI in higher education. It highlights the need for comprehensive, EMI-specific PD that goes beyond language training to address pedagogical skills, assessment literacy, and strategies for supporting students’ disciplinary language development. The importance of context-specific approaches and institutional support is emphasized. The chapter outlines several promising directions for future research, including long-term studies on PD impact, comparative research across contexts, and investigations incorporating student perspectives. It also calls for more research on EMI teacher competencies, the integration of ESP approaches, and the use of technology in EMI PD. The chapter concludes that as EMI continues to expand globally, sustained investment in faculty PD is crucial to ensure high-quality education that meets both content and language learning goals in increasingly diverse and internationalized higher education settings.