Marchesini graduated in Psychology at the Sapienza University of Rome in 1975 and attended, from the following year, the Silvio D'Amico National Academy of Dramatic Arts.
He started acting on stage in 1975, was first cast as a voice actor in 1980, and founded Il Trio in 1982 with Tullio Solenghi and Anna Marchesini: the Trio debuted on Rai Radio 2 with the Hellzapoppin radio show. [3 ]