Queirolo was born in 1861 in Villarrica[1] to Miguel Angel Queirolo, who was Italian, and Maria de los Dolores Larramendi, who was also from Villarrica.
In 1900, amidst a crisis provoked by political titan José Segundo Decoud's resignation from Emilio Aceval's cabinet and from the Colorado Party, he was given the role of Minister of Foreign Affairs by Aceval as a conciliatory measure.[4] He resigned from the cabinet after controversies regarding the fairness of the 1901 Legislative Elections.[5]
Around this time Queirolo was described by the resident Brazilian diplomat in Paraguay as a "cattle rancher who rarely appeared in Asunción".[4] He had, however, been a journalist for most of his life before taking up the Ministry, and had returned to a newspaper called "El Cívico" after leaving that post.
He died on 23 November 1901, after a short illness.[6][7]