sentences:  He served as a staff member of the Pío XII Seminary in Mercedes from 1944 until 1959.Pironio served as the vicar general of the Diocese of Mercedes from 1959 until a year later, and he went on to serve as the rector of the Metropolitan Seminary of Villa Devoto from 1960 to 1964.He attended the Second Vatican Council from 1962 to 1964 as an expert.