He is a frequent columnist in Italian newspapers including Il Foglio, Il Tempo, L'Arena, Il Sussidiario.
In 1899 he moved to Milan to become editor of the daily Il Tempo, which under his stewardship became a leading voice for greater democracy and the Italian Reformist Socialist movement.
He was editor-in-law of Il Tempo from 1973 to 1987; that year, he left the newspaper in order to enter into the Fininvest group owned by Silvio Berlusconi.
It was founded in Rome, Italy by Renato Angiolillo in 1944 and currently publishes the Rome edition (available nationally) and other five local editions (Latina, Frosinone, Northern Lazio, Abruzzo and Molise).
In 1994 he moved on to il Giornale with the journalist Vittorio Feltri and returned few years later after a period as editor of the newspaper Il Tempo in 1996.
After collaborations with Italian newspapers such as MF Milano Finanza, Finanza & Mercati, Il Tempo, Aspenia, Limes and others, Casertano joined Milan-based business newspaper Linkiesta in 2010, as international correspondent.
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During 2008 the following exhibitions took place : "Traghettare il tempo" at the National Museums at Villa Pisani (Stra), "Oltre" at the Net Center in Padua and "Oltre l'immagine" at the Civic Museum at Piazza del Santo in Padua.