Recent nationalist and isolationist policies coupled with travel restrictions have prompted a shift in perspectives on the internationalization of higher education. Furthermore, criticisms surrounding issues such as the widespread adoption of English as a medium of instruction in higher education and quality assurance of transnational programs have emerged, with increasing calls for more inclusive models and greater emphasis on quality over quantity. This paper presents an evaluative study of a transnational Master of Arts in the Teaching of English to Speakers of Other Languages (MATESOL) program delivered in partnership by an institution in Singapore (SI) and a university in New Zealand (NZU) and designed for English language teachers from the Association of Southeast Asian Nations (ASEAN) region. Drawing on an impact evaluation, the paper identifies key design features in the program that contributed to its effectiveness as an inclusive model of English medium instruction (EMI) and internationalization in transnational higher education (TNHE).