Marciano grew higher inside New Jersey and has admitted to having the turbulent youth, "I was hanging around on street corners, drinking, gambling, playing cards, going to the racetrack, shooting pool, all those kind of things". At the age of xvii, Marciano was taking part around the car crash when a nighttime out partying & was lucky to subsist. This prompted him to sort his life out & he enrolled at Northeastern University, Boston to study Biomedical Engineering. When the dissatisfactory begin, Marciano transferred to Economics and Accounting for his second month prior to dropping dead set pursue acting.

Around 1985, Marciano moved to Los Angeles where he got his large break 2 years late as a guest star within Wiseguy. Extra little area followed until he landed a a share of Detective Vecchio in Due South in 1994. He played a a share for 2 seasons prior to his character was written retired, replaced by Detective Stanley Kowalski, due to filming commitments. He returned for the series finale in which Vecchio & Kowalski's ex-ex meeting.

Around 1991 Marciano married Katayoun Amini (who played Vecchio's ex-ex Angie inside Due South) and together it have a girl, Ariana Grace.