This research analyzes the organizational culture of The Connext ED Foundation, a foundation established to develop Thai educational quality enhancement, and its impact on organizational success. Using qualitative methods, including in-depth interviews and content analysis, the study examines executives, employees, and foundation project participants. Findings reveal that the foundation integrates four organizational cultures: Clan Culture, fostering collaboration and engagement; Hierarchy Culture, ensuring structure and efficiency; Adhocracy Culture, promoting innovation and adaptability; and Altruistic Culture, driving social impact. This balanced cultural integration enhances employee engagement, operational efficiency, and sustainable innovation. Key enablers, such as visionary leadership, open communication, and flexible structures, create an environment conducive to long-term success. The study highlights how educational foundations and/or non-profit organizations can design a culture that harmonizes diverse values while prioritizing social good. These insights contribute to the broader understanding of cultural integration in educational foundations and/or non-profit organizations, emphasizing that a well-balanced culture fosters both internal effectiveness and external impact. The findings provide a framework for other organizations aiming to achieve sustainable social transformation through strategic cultural management.