Former Nicaraguan Ambassador to Spain, he is a professor of Public International Law and International Relations at the Autonomous University of Madrid. He is also a professor at the National Autonomous University of Nicaragua, as well as a visiting professor at different universities in Europe and Latin America. He was legal director of the Ministry of Foreign Affairs and chief of staff of the Foreign Minister from 1979 to 1990. He was part of the Nicaraguan negotiating team in the Contadora and Esquipulas peace processes, from their inception until the electoral defeat of Sandinismo. Nicaraguan lawyer in the case against the United States at the International Court of Justice, he has participated in numerous diplomatic missions. A full member of the Academy of Geography and History of Nicaragua, he has collaborated in the newspaper "El Mundo" and in other press in Spain and Latin America for more than a decade. His works include "The future of Nicaragua" (1995; 2nd augmented edition, 2001), "Military and paramilitary activities in and against Nicaragua2 (1999)," The collapse of the World Order "(2002) and" Peace mocked. The peace processes of Contadora and Esquipulas "(2006).