Teddy Riley is said to be the father of New Jack Swing, also Tony Toni Toné, Johnny Gill, Gerald Levert, Bobby Brown, Blackstreet, New Edition and Guy were big names in the New Jack era.
The movie New Jack City (1991) also contains a lot of New Jack Swing music.
They who think wrong are they who can't do that"
-Rakim, Lyrics of Fury
a new jack can also be some one who all of a sudden became "interested" in a scene and the next day dress as best they can to fit into the scene.