John Charles MacKenzie is a Canadian actor. He is best known for portraying Skip Fontaine on the HBO series Vinyl (2016) and Reagan "Normal" Ronald on the Fox series Dark Angel (2000–2002). He has also appeared in several films directed by Martin Scorsese, including The Departed (2006), The Wolf of Wall Street (2013), and The Irishman (2019).

Dark Angel is an American science fiction drama television series that premiered on the Fox network on October 3, 2000. Created by James Cameron and Charles H. Eglee, it stars Jessica Alba in her breakthrough role. Set in 2019, the series chronicles the life of Max Guevara (Alba), a runaway genetically enhanced supersoldier who escapes from a covert military facility as a child. In a dystopian near-future Seattle, she tries to lead a normal life while eluding capture by government agents and searching for her brothers and sisters scattered in the aftermath of their escape. Dark Angel was the only show produced by the company Cameron/Eglee Productions, and was filmed in Vancouver at Lions Gate Studios.