When twenty-one years of age he composed a treatise on the figure of the earth, and the reputation which he soon acquired led to his appointment by the King of Sardinia to the professorship of philosophy in the College of Casale.

His friendship with Radicati, a man of liberal opinions, occasioned Frisi's removal by his clerical superiors to Novara, where he was compelled to do duty as a preacher.

[1] In 1753 he was elected a corresponding member of the Paris Academy of Sciences, and shortly afterwards he became professor of philosophy at the Barnabite College of St Alexander at Milan.

From several European crowned heads he received, at various times, marks of special distinction, and the empress Maria Theresa granted him a yearly pension of 100 sequins.

[1] In 1764 he was created professor of mathematics in the palatine schools at Milan, and obtained from Pope Pius VI the release from ecclesiastical jurisdiction, and authority to become a secular priest.