Known for his scholarship relating political philosophy to international law (in particular his defense of humanitarian intervention), and his work on political rhetoric, Professor Tesón is author of Humanitarian Intervention: An Inquiry into Law and Morality (3rd ed fully revised and updated, Transnational Publishers 2005); Rational Choice and Democratic Deliberation (Cambridge University Press 2006) [with Guido Pincione]; A Philosophy of International Law (Westview Press 1998); and many articles in law, philosophy and international relations journals and collections of essays.
He has served as a Professor of Law and Affiliate Professor of Philosophy at Arizona State University, where he taught for 17 years prior to joining Florida State University's faculty. Before entering academia, Professor Tesón was a career diplomat for the Argentina Foreign Ministry in Buenos Aires for four years. He resigned from the Argentine foreign service in 1981 to protest against the human rights abuses of the Argentine government. He has served as visiting professor at Cornell Law School, Indiana University School of Law, University of California Hastings College of Law, the Oxford-George Washington International Human Rights Program, and is Permanent Visiting Professor, Universidad Torcuato Di Tella, Buenos Aires, Argentina.