Dr. Will Brehm's research interrogates the intersection of comparative and international education with international relations and the political economy of development, focused primarily on the Mekong sub-region of Southeast Asia. A focus on history generally and the methodology of historical materialism specifically are the threads that tie together the different areas of his research. His research career began with a focus on the history of the field of comparative and international education, detailing the ways in which specific individuals and institutions were influenced by US geopolitics during the Cold War. 

In Southeast Asia, Will's research first focused on Cambodia where he explored, both before and during his doctoral studies, various issues of social injustice and education inequality resulting from the system of shadow education, also known as private supplementary tutoring. His interests in Cambodia focused primarily on the ways in which historic cultural norms dovetailed with development efforts in the 1990s to produce the conditions under which private tutoring became necessary and acceptable, despite the inequality that it produced. This research is pulled together in his book entitled Cambodia for Sale (2021, Routledge), which was called a 'pathbreaking inquiry.'

The next stage of Will's research career focused on the inverse of his previous interests in Cambodia while also looking comparatively across countries: instead of exploring how history determined the present, Will shifted to the way in which the present interprets history. This research strand focused on the development of a regional identity through education systems across five countries in the Mekong sub-region of Southeast Asia. It explored the struggles between regional and national identities by looking at the process of history curriculum design at the regional level inside UNESCO Bangkok and at the national level inside five ministries of education.

Will's most recent strand of research looks at the history of an idea. Specifically, it looks at the way in which the idea of human capital theory developed, evolved, and gained prominence in international development and education.