Gabriel Onofre holds a PhD and an MA in History from Fluminense Federal University, where he also earned a BA in History. During his doctoral studies, he conducted a research stay at the Hoover Institution, with an International Scholar Research Support fellowship from Stanford University.

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He is conducting postdoctoral research in the Graduate Program in History at Fluminense Federal University (PPGH/UFF), where he develops research on anti-communism and the Cold War in the Global South.

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He is a teacher at Colégio Pedro II, working in basic education, teacher training, and graduate studies in History.

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He is the author of books and teaching materials approved by the National Textbook Program (PNLD). He is a member of the Asian Studies Group (GEA/UFF) and the Research Center for Right-Wing Politics, History, and Memory.