Leoz was born in
Asunción-Pirizal, Paraguay. His childhood was spent in Pirizal, in the industrial complex of Carlos Casado, near the
Paraguay River, Puerto Casado today is known as
Puerto La Victoria. From 1940 to 1950, Leoz was a sports journalist in radio and newspapers. In 1957, he studied law at the School of Law and Social Sciences of the UNA (
National University of Asunción) and as a student took office in
Judiciary as a scribe in interrogations; he graduated on 24 December 1957, at 29 years age. From 1950 to 1962, he was a history teacher at the
Colegio Nacional de la Capital,
Nacional de Niñas and Comercio. He was also a director for an aluminum enterprise and in agricultural livestock. From 1957 to 1977, he was president of the Tribunal de Justicia de la Confederación Paraguaya de Básquetbol. • Doctor "Honoris causa" from Universidade of
Rio de Janeiro, Brazil. • Member of Honor of the Universidad Nacional of San Agustín of
Arequipa, Peru. ==Timeline of football career==