New Model Army are an English rock band formed in Bradford, West Yorkshire, in 1980 by lead vocalist, guitarist and principal songwriter Justin Sullivan, bassist Stuart Morrow and drummer Phil Tompkins. Sullivan has been the only continuous member of the band, which has seen numerous line-up changes in its four-decade history. Their music draws on influences across the musical spectrum, from punk and folk to soul, metal and classical. Sullivan's lyrics, which range from directly political through to spiritual and personal, have always been considered as a key part of the band's appeal.

Justin Edward Sullivan is an English singer, songwriter and musician. He is also the lead vocalist, guitarist and principal songwriter of English rock band New Model Army, which he formed in 1980 together with drummer Robert Heaton and bassist Stuart Morrow in their hometown of Bradford, West Yorkshire. In the early 1980s he performed under the stage name of "Slade the Leveller", referring to the political movement of the Levellers. His parents are Quaker.