His family were Irish immigrants. His rise to power is described as being very similar to Tommy Shelby, thus it is reasonable to assume he grew up in a poor and rough environment. The first man he killed was a priest. He eventually became a very powerful gangster, being on the level of those as the Peaky Blinders. He also stated to be religious and that he disliked how the Catholics were treated in America. He is respected by Tommy due to him climbing to the top by himself, much like Tommy himself.