Professor Barrozo specializes in criminal law, constitutional law, international law, and international and comparative politics (US and Brazil). His work offers new understandings of rights, childhood, human endowments, punishment, cruelty, structural mercy, the political, legal education, markets institutionalization, and the nature and evolution of law. Barrozo is an active advocate for the rights of the neurodiverse and the un-parented, appearing before international bodies such as the Inter-American Commission on Human Rights and the United Nations.