I don't know... I have a whole family of immigrants and some are around Americans exclusively. It's been my experience that if you reach a certain age, you never lose the accent, even if it's just slight. And if he was old enough to be made in italy, he certainly would have passed that age. But anyway it's a small detail. Awesome character. I would have loved to see more of him. I did hear that he left the show so abruptly cause he could never remember his lines. I think vito confirmed that in an interview