The records of the Civil Registry indicate that he was from Asunción, Paraguay's capital, born on March 17, 1884 from Pedro Guggiari and Petrona Corniglione, with Italian]] and Swiss ancestry.

He attended primary school in Villarrica in the interior, and secondary studies in the Colegio Nacional de la Capital in Asunción, graduating with a degree in science and letters.

Together with vice president Emiliano González Navero and a cabinet made up of Eligio Ayala, Rodolfo González and Justo Pastor Benítez, in the Ministry of Finance; Belisario Rivarola, Luis de Gásperi, Justo Pastor Benítez and Víctor Abente Haedo, in Interior; Rodolfo González, Eladio Velásquez, Justo Pastor Prieto, Justo Pastor Benítez and Alejandro Arce, in Justice, Worship and Public Instruction; Eliseo Da Rosa, Manlio Schenoni and Raúl Casal Ribeiro, in War and Navy; Gerónimo Zubizarreta and Higinio Arbo, in Foreign Affairs, he tried to prepare Paraguay with a conflict with Bolivia, which then was seen as inevitable.

In 1928, the National Congress of Defense was constituted, with little success, despite the circumstances; in 1929, after arduous debates, the Archdiocese of Asunción was created, and Juan Sinforiano Bogarín named as the first archbishop.

The gunboats Humaitá and Paraguay were acquired; they played a key role during the Chaco War with Bolivia, which began towards the end of his government.

The protest had originated because President Guggiari decided to keep his movements in the Chaco in secret because it was dangerous to share them with the press because he could alert the adversary, who at the time was Bolivia.

The next day, students from the National College and the Normal School were invited to a new demonstration to protest the hostility shown by the police force on the eve.

The column of students went through the newsrooms, threw stones at the premises of El Liberal and arrived at the Government Palace, where the President of the Republic was.

Then, refugee in the Military School, he delegated the presidential command in González Navero and asked the National Congress for his political judgment.

Arturo Bray, according to his own memories, Dr. Guggiari requested his trial by Congress, transferring from that date and until January 17, 1932, the first magistracy to the vice president, who was Mr. Emiliano González Navero.