His book Slave Emancipation and Transformations in Brazilian Political Citizenship (Pittsburgh, 2016) probes the wide-ranging effects of the process on abolition on popular political practice and the racial borders of national belonging. It follows an edited volume Castilho co-organized in Brazil, Tornando-se Livre (EDUSP, 2015), and two-prize winning articles published in 2010 and 2013, respectively. Currently, he is writing a book on antislavery, race, and theater in the Atlantic world, focusing on the dramatic representations of Uncle Tom’s Cabin.