Ventimiglia was born in Ridgewood, Queens to a Sicilian American family, and grew up in Teaneck, New Jersey, graduating from Teaneck High School in 1981, where he played on the football team. He currently lives in Brooklyn with his two daughters. He is not related to the actor Milo Ventimiglia, who appeared on the TV series Heroes and Gilmore Girls. In 2016, he played Harry Magarac on the episode of Elementary, entitled "Murder Ex Machina", first aired on January 21, 2016. He also did narration for the Nat Geo television documentary series Inside the American Mob.