John Kerr worked as a police roundsman and court report for a daily newspaper in New Zealand, and has resided in Melbourne and Sydney since 1977.

He has published many true crime books, including Untold Violence; Walsh Street; Neddy: the life and crimes of Arthur 'Neddy' Smith; The Phillip Island Murder; Hellbent: Ces Waters and Me; and Roger Rogerson's memoir, The Dark Side.

He is the author of Wanted: John & Lucy about the helicopter hijack and prison break, Bloody Relations: true stories of murder in the family, The Hit Men: Australia's Contract Killers, this country's first book on such men, as well as  a series of 96-page books on true-crime themes.