Mastroianni grew up in Toronto, the son of Angela and Angelo Mastroianni.[5][6] He is of Italian heritage. He later recalled that he had first heard about the audition of Degrassi over his school's PA system.[7]
After Degrassi High ended in 1992, Mastroianni worked as a waiter and a paver in his father's construction business and gave up college for acting when his university mandated that he devote all his time to his studies. He had roles in several Canadian productions, including Liberty Street and Music Works. Though he was quoted as saying in 1998 that there was "very little" chance of a Degrassi sequel,[citation needed]Degrassi: The Next Generation began in 2001, where Mastroianni reprised his role as Joey for five seasons.
Mastroianni was a guest star on the supernatural medical drama Saving Hope.
^ abPlaying with Time, Inc (June 1989). "All in a good cause". Classmates Newsletter. Retrieved May 3, 2021. {{cite news}}: |first= has generic name (help)
Gemini 1986–2011, Canadian Screen Awards 2012–present. Separate awards were presented by gender prior to 2022; a single unified category for best performance regardless of gender has been presented since.