The author of ten books , he worked as a journalist and was well known for interviewing world figures such as Muhammad Ali , Ted Kennedy , Jorge Rafael Videla , Raúl Alfonsín , José Mujica , Eduardo Frei Ruiz-Tagle , Carlos Fuentes , Mario Vargas Llosa , Ernesto Sabato and Augusto Roa Bastos .
He was the author of ten books . He worked as a journalist and his interviews are well known to world figures such as Cassius Clay , Ted Kennedy , Jorge Rafael Videla , Raúl Alfonsín , José Mujica , Eduardo Frei Ruiz-Tagle , Carlos Fuentes , Mario Vargas Llosa , Ernesto Sabato and Augusto Roa Bastos .