His research and teaching focus on the intersections of Asian North American, Filipino, Sexuality, and Postcolonial Studies. His first project, Reparative Acts: Performing Queer Redress in Philippine Nationalisms interrogates the relationship between histories of nationalism, imperialism, and redress. His second book project, Queer Filipinos and Canadian Multiculturalisms centers on the experiences of queer Filipinos in Canada in order to track how the diaspora's histories with multiple forms of colonialism and racialization offer new perspectives for problematizing the limits of Canadian multiculturalism. Diaz is also committed to community engagement and social justice, by working with LGBT and Filipino focused organizations such as ACAS and Kapisanan in the Greater Toronto Area.