John Anthony David Sloman was born in Cardiff (South Wales), 26 April 1957 as the eldest of six children. He is a former member of Trapper, Pulsar, Lone Star, and Uriah Heep (between 1979–1981). While in Uriah Heep, Sloman took over lead vocal duties from John Lawton. Additionally, Sloman played Keyboards.
After Uriah Heep, he formed the band 'John Sloman's Badlands' and showcased several songs at The Marquee Theatre. 'John Sloman's Badlands' featured former Trapper drummer John Munro and Whitesnake's Neil Murray. John went on to record the first of his solo albums Disappearances Can Be Deceptive produced by Todd Rundgren. Since Disappearances Sloman released two more solo albums: Dark Matter in 2003 and 13 Storeys in 2006 on which John is credited with playing everything from cello to harmonium. He is also credited in the soundtrack of Highlander: The Source as the vocalist who sang Queen's hits "Princes of the Universe" and "Who Wants to Live Forever".
He released his latest solo album in 2010 titled Reclamation.